{"id":2705,"date":"2022-01-11T18:16:08","date_gmt":"2022-01-11T18:16:08","guid":{"rendered":"https:\/\/otus.ru\/journal\/?p=2705"},"modified":"2022-01-11T18:16:10","modified_gmt":"2022-01-11T18:16:10","slug":"osnovy-sql-rabota-s-tablicami-i-ih-soedineniem","status":"publish","type":"post","link":"https:\/\/otus.ru\/journal\/osnovy-sql-rabota-s-tablicami-i-ih-soedineniem\/","title":{"rendered":"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u0411\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u2013 \u0442\u043e, \u0447\u0442\u043e \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0431\u0438\u0437\u043d\u0435\u0441\u0443, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0433\u043e\u0441\u0443\u0434\u0430\u0440\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u043c \u043e\u0440\u0433\u0430\u043d\u0430\u043c \u0438 \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u044f\u0442\u0438\u044f\u043c. \u042d\u0442\u043e \u2013 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u0420\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441 \u043d\u0438\u043c\u0438 \u0434\u043e\u043b\u0436\u0435\u043d \u0443\u043c\u0435\u0442\u044c \u043a\u0430\u0436\u0434\u044b\u0439, \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u043a\u043e\u0433\u0434\u0430 \u0440\u0435\u0447\u044c \u0437\u0430\u0445\u043e\u0434\u0438\u0442 \u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0411\u0414 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438. \u0421 \u043d\u0438\u043c\u0438 \u0441\u043e\u0432\u0435\u0440\u0448\u0430\u044e\u0442 \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u043d\u044b\u0435 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u044e\u0442 \u0442\u0435\u043c \u0438\u043b\u0438 \u0438\u043d\u044b\u043c \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u043c;<\/li><li>\u0443\u0434\u0430\u043b\u044f\u044e\u0442;<\/li><li>\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0442;<\/li><li>\u0441\u043e\u0445\u0440\u0430\u043d\u044f\u044e\u0442;<\/li><li>\u0432\u044b\u0432\u043e\u0434\u044f\u0442 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u0435\u043b\u0430\u0435\u0442\u0441\u044f \u044d\u0442\u043e \u0438\u043b\u0438 \u043f\u043e\u0441\u0440\u0435\u0434\u0441\u0442\u0432\u043e\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0443\u0442\u0438\u043b\u0438\u0442, \u0438\u043b\u0438 \u0447\u0435\u0440\u0435\u0437 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0435 \u044f\u0437\u044b\u043a\u0438 \u00ab\u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f\u00bb. \u0421 \u043d\u0438\u043c\u0438 \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c \u0437\u043d\u0430\u043a\u043e\u043c \u043a\u0430\u0436\u0434\u044b\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0435\u0440.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 SQL<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0427\u0442\u043e\u0431\u044b \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u0445, \u0438\u0433\u0440\u0430\u0445 \u0438 \u043f\u0440\u043e\u0447\u0435\u043c \u043a\u043e\u043d\u0442\u0435\u043d\u0442\u0435, \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c SQL. \u042d\u0442\u043e \u2013 \u0441\u0430\u043c\u044b\u0439 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043d\u044b\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u044f \u0441\u043e\u0431\u044b\u0442\u0438\u0439.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0430\u043a \u043d\u0430\u0437\u044b\u0432\u0430\u044e\u0442 \u044f\u0437\u044b\u043a \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041e\u043d \u0434\u0430\u0435\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u0442\u044c, \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c \u0438 \u0438\u0437\u0432\u043b\u0435\u043a\u0430\u0442\u044c \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u0438\u0437 \u0440\u0435\u043b\u044f\u0446\u0438\u043e\u043d\u043d\u044b\u0445 \u0431\u0430\u0437 \u0434\u0430\u043d\u043d\u044b\u0445.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u041e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u2013 \u0447\u0442\u043e \u0443\u043c\u0435\u0435\u0442 \u044f\u0437\u044b\u043a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 SQL \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\/\u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u0441\u043c\u043e\u0436\u0435\u0442:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0437\u0430\u043f\u043e\u043b\u0443\u0447\u0430\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0411\u0414;<\/li><li>\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0445, \u0438\u0445 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440;<\/li><li>\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0442\u044c \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u044b\u0435 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u044b \u0432 \u00ab\u0442\u0430\u0431\u043b\u0438\u0447\u043d\u043e\u043c \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435\u00bb, \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u044f \u043e\u043d\u044b\u043c\u0438;<\/li><li>\u043f\u0440\u043e\u0432\u043e\u0434\u0438\u0442\u044c \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 \u0441 \u0438\u043d\u044b\u043c\u0438 \u044f\u0437\u044b\u043a\u0430\u043c\u0438 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043c\u043e\u0434\u0443\u043b\u0435\u0439, \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a \u0438 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u0432 SQL;<\/li><li>\u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u043d\u043e\u0432\u044b\u0435 \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0438, \u0443\u0434\u0430\u043b\u044f\u0442\u044c \u0441\u0442\u0430\u0440\u044b\u0435;<\/li><li>\u0437\u0430\u043d\u0438\u043c\u0430\u0442\u044c\u0441\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435\u043c \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0439, \u0445\u0440\u0430\u043d\u0438\u043c\u044b\u0445 \u043f\u0440\u043e\u0446\u0435\u0434\u0443\u0440 \u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u0439.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0430\u043a\u0436\u0435 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0411\u0414 \u0437\u0430 \u0441\u0447\u0435\u0442 SQL \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f\u043c, \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c \u0438 \u043f\u0440\u043e\u0446\u0435\u0434\u0443\u0440\u0430\u043c. \u0413\u043b\u0430\u0432\u043d\u043e\u0435 \u0437\u043d\u0430\u0442\u044c, \u043a\u0430\u043a\u0438\u043c \u0438\u043c\u0435\u043d\u043d\u043e \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412 SQL \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0442 \u0432\u0441\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0443\u0434\u0430\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c \u0442\u0435 \u0438\u043b\u0438 \u0438\u043d\u044b\u0435 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438. \u0414\u0430\u043b\u0435\u0435 \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043d\u043e \u0432\u0441\u0435\u0433\u043e \u043e\u0431 \u043e\u0434\u043d\u043e\u043c \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0432\u0430\u0436\u043d\u043e\u043c \u043c\u043e\u043c\u0435\u043d\u0442\u0435. \u0410 \u0438\u043c\u0435\u043d\u043d\u043e \u2013 \u043a\u0430\u043a \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 Join. \u041e\u043d \u043f\u0440\u0438\u0433\u043e\u0434\u0438\u0442\u0441\u044f \u0438 \u043d\u043e\u0432\u0438\u0447\u043a\u0430\u043c, \u0438 \u0442\u0435\u043c, \u043a\u0442\u043e \u0434\u043e\u043b\u0433\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0411\u0414.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0427\u0442\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u043e\u0431\u043e\u0439 JOIN<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">JOIN \u2013 \u043a\u043e\u043c\u0430\u043d\u0434\u0430\/\u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f, \u043a\u043e\u0433\u0434\u0430 \u043d\u0443\u0436\u043d\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0441\u0442\u0438 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0446 \u0432 \u0431\u0430\u0437\u0430\u0445 \u0434\u0430\u043d\u043d\u044b\u0445. \u0412\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435 \u043d\u0435\u0435 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0434\u0432\u0443\u0445 \u0441\u0442\u0440\u043e\u043a \u0432 \u043e\u0434\u043d\u0443. \u0418 \u043d\u0435 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u043e\u043d\u044b\u0435 \u043e\u043a\u0430\u0436\u0443\u0442\u0441\u044f \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0430\u0445. JOIN \u043c\u043e\u0436\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0432 \u043f\u0440\u0435\u0434\u0435\u043b\u0430\u0445 \u043e\u0434\u043d\u043e\u0433\u043e \u00ab\u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430\u00bb \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041a\u043e\u043c\u0430\u043d\u0434\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0438 \u0434\u0432\u0443\u0445 \u0438 \u0431\u043e\u043b\u0435\u0435 \u0442\u0430\u0431\u043b\u0438\u0446 \u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0435 SQL. \u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 JOIN \u2013 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. \u0421\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u0437\u0434\u0435\u0441\u044c \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u043f\u0440\u043e\u0441\u0442\u043e\u0439. \u041d\u043e \u0441\u0442\u043e\u0438\u0442 \u043e\u0431\u0440\u0430\u0442\u0438\u0442\u044c \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043e\u0432 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e. \u0423 \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u2013 \u0441\u0432\u043e\u044f \u0437\u0430\u043f\u0438\u0441\u044c.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0422\u0438\u043f\u044b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u0441\u043b\u0438\u044f\u043d\u0438\u044f \u0437\u0430\u0432\u0438\u0441\u044f\u0442 \u043e\u0442 \u0442\u043e\u0433\u043e, \u0447\u0442\u043e \u0438\u043c\u0435\u043d\u043d\u043e \u0445\u043e\u0447\u0435\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0432 \u043a\u043e\u043d\u0435\u0447\u043d\u043e\u043c \u0438\u0442\u043e\u0433\u0435. \u0421\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u0442\u0438\u043f\u044b \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439 \u0442\u0430\u0431\u043b\u0438\u0446 \u0438 \u0438\u043d\u044b\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u0432 \u0432 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u043e\u043c \u044f\u0437\u044b\u043a\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u043f\u0440\u043e\u0441\u0442\u043e\u0435;<\/li><li>left outer join;<\/li><li>right outer join;<\/li><li>full outer join.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u041a\u0430\u0436\u0434\u044b\u0439 join \u0437\u0430\u043f\u0440\u043e\u0441 \u0432 SQL \u0438\u043c\u0435\u0435\u0442 \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0435 \u043d\u044e\u0430\u043d\u0441\u044b. \u041e \u043d\u0438\u0445 \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430\u043d\u043e \u0434\u0430\u043b\u0435\u0435. \u0420\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f, \u043a\u0430\u043a\u043e\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043f\u043e\u0434\u043e\u0439\u0434\u0435\u0442 \u0432 \u0442\u043e\u043c \u0438\u043b\u0438 \u0438\u043d\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u043f\u043e\u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u043e\u0441\u0442\u0430\u044f \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a\u0430. \u0422\u0430\u043c \u0442\u043e\u0436\u0435 \u0435\u0441\u0442\u044c \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. \u0415\u0441\u043b\u0438 \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0439 \u0432\u043e\u043f\u0440\u043e\u0441 \u0442\u0430\u043c, \u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0441\u043f\u0435\u0445\u0430 \u0443\u0434\u0430\u0441\u0442\u0441\u044f \u0432 \u0441\u0447\u0438\u0442\u0430\u043d\u043d\u044b\u0435 \u043c\u0438\u043d\u0443\u0442\u044b.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u0430\u0436\u043d\u043e: \u0435\u0441\u0442\u044c \u0435\u0449\u0435 \u043e\u0434\u0438\u043d \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u2013 cross join. \u0412\u0441\u0442\u0440\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 \u043d\u0435 \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0447\u0430\u0441\u0442\u043e, \u043d\u043e \u043f\u043e\u043c\u043d\u0438\u0442\u044c \u043e \u043f\u043e\u0434\u043e\u0431\u043d\u043e\u043c \u0440\u0430\u0441\u043a\u043b\u0430\u0434\u0435 \u0442\u043e\u0436\u0435 \u043d\u0443\u0436\u043d\u043e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u041f\u0440\u043e\u0449\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0433\u043e \u2013 Inner<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0435\u0440\u0432\u044b\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u2013 \u044d\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0433\u043e \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f. \u0412\u0441\u0442\u0440\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 \u0447\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e. \u0412\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u043f\u0435\u0440\u0435\u0441\u0435\u0447\u0435\u043d\u0438\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 (\u043e\u0431\u044b\u0447\u043d\u043e \u0434\u0432\u0443\u0445) \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432. \u0412 \u0442\u0430\u0431\u043b\u0438\u0447\u043d\u043e\u0439 \u0442\u0435\u0440\u043c\u0438\u043d\u043e\u043b\u043e\u0433\u0438\u0438 &#8212; \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0432\u043e\u0437\u0432\u0440\u0430\u0442 \u0437\u0430\u043f\u0438\u0441\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0438\u043c\u0435\u0435\u0442\u0441\u044f \u0432 \u043e\u0431\u043e\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u0445. \u041e\u043d\u0430\u044f \u0434\u043e\u043b\u0436\u043d\u0430 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u0437\u0430\u0440\u0430\u043d\u0435\u0435 \u043a\u0440\u0438\u0442\u0435\u0440\u0438\u044e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0437\u0430\u0434\u0430\u0447\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f INNER JOIN. \u0427\u0442\u043e\u0431\u044b \u043b\u0443\u0447\u0448\u0435 \u043f\u043e\u043d\u0438\u043c\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441, \u0441\u0442\u043e\u0438\u0442 \u0441\u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c\u0443 \u0412\u0435\u043d\u043d\u0430:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u043d\u0430\u0440\u0438\u0441\u043e\u0432\u0430\u0442\u044c \u043a\u0440\u0443\u0433 \u2013 \u043f\u0443\u0441\u0442\u044c \u044d\u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u00ab\u0442\u0430\u0431\u043b\u0438\u0446\u0430 1\u00bb;<\/li><li>\u0440\u044f\u0434\u043e\u043c, \u0437\u0430\u0434\u0435\u0432\u0430\u044f \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u043f\u0435\u0440\u0432\u043e\u0439 \u0444\u0438\u0433\u0443\u0440\u044b, \u0438\u0437\u043e\u0431\u0440\u0430\u0437\u0438\u0442\u044c \u0432\u0442\u043e\u0440\u043e\u0439 \u043a\u0440\u0443\u0433 \u2013 \u044d\u0442\u043e \u00ab\u0442\u0430\u0431\u043b\u0438\u0446\u0430 2\u00bb;<\/li><li>\u0437\u0430\u043a\u0440\u0430\u0441\u0438\u0442\u044c \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u043f\u0435\u0440\u0435\u0441\u0435\u0447\u0435\u043d\u0438\u044f \u2013 \u044d\u0442\u043e \u0438 \u0435\u0441\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 inner join.<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"209\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/1-9.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2708\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/1-9.jpg 453w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/1-9-300x138.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/1-9-150x69.jpg 150w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/1-9.jpg\",\"width\":\"453\",\"height\":\"209\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0420\u0438\u0441\u0443\u043d\u043e\u043a \u0432\u044b\u0448\u0435 \u2013 \u043d\u0430\u0433\u043b\u044f\u0434\u043d\u044b\u0439 \u043f\u0440\u0438\u043c\u0435\u0440 \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c\u044b \u0412\u0435\u043d\u043d\u0430. \u0421 \u0435\u0433\u043e \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0443\u0434\u0430\u0441\u0442\u0441\u044f \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u0432 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0430\u0445 \u00ab\u043f\u0440\u043e\u0441\u0442\u043e\u0433\u043e\u00bb \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0447\u0435\u043a.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0417\u0430\u043f\u0438\u0441\u044c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u0442\u043e\u0433\u043e, \u0447\u0442\u043e\u0431\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c \u0442\u0435 \u0438\u043b\u0438 \u0438\u043d\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0432 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432\u043e\u043c \u044f\u0437\u044b\u043a\u0435, \u0441\u0442\u043e\u0438\u0442 \u0443\u0442\u043e\u0447\u043d\u0438\u0442\u044c \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u0436\u0435\u043b\u0430\u0435\u043c\u043e\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u044b. \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u0441 \u043e\u0431\u044b\u0447\u043d\u044b\u043c (\u043f\u0440\u043e\u0441\u0442\u044b\u043c) \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0448\u0430\u0431\u043b\u043e\u043d:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"420\" height=\"176\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/2-7.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2709\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/2-7.jpg 420w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/2-7-300x126.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/2-7-150x63.jpg 150w\" sizes=\"auto, (max-width: 420px) 100vw, 420px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/2-7.jpg\",\"width\":\"420\",\"height\":\"176\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0417\u0434\u0435\u0441\u044c \u043d\u0438\u043a\u0430\u043a\u0438\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u0443\u0442\u044c \u043d\u0435 \u0434\u043e\u043b\u0436\u043d\u043e. \u041a\u043e\u0434 \u043b\u0435\u0433\u043a\u043e \u0447\u0438\u0442\u0430\u0435\u0442\u0441\u044f:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0432\u044b\u0431\u0440\u0430\u0442\u044c \u043a\u043e\u043b\u043e\u043d\u043a\u0438;<\/li><li>from table1 \u2013 \u0438\u0437 \u043f\u0435\u0440\u0432\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b;<\/li><li>\u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0438\u0442\u044c \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0435\u0439 2.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u043d\u0430\u0433\u043b\u044f\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u0438\u043c\u0435\u0440\u0430 \u0441\u0442\u043e\u0438\u0442 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0442\u0430\u0431\u043b\u0438\u0446 \u0441 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0435\u0439, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438\u043d\u0446\u0438\u043f joins \u0442\u0438\u043f\u0430 inner.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u041d\u0430\u0433\u043b\u044f\u0434\u043d\u044b\u0439 \u043f\u0440\u0438\u043c\u0435\u0440<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0443\u0441\u0442\u044c \u0431\u0443\u0434\u0435\u0442 \u0434\u0430\u043d\u0430 \u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u043f\u043e\u0434 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u0435\u043c customer. \u0412 \u043d\u0435\u0439 \u0442\u0430\u043a\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"735\" height=\"249\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/3-5.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2710\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/3-5.jpg 735w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/3-5-300x102.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/3-5-150x51.jpg 150w\" sizes=\"auto, (max-width: 735px) 100vw, 735px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/3-5.jpg\",\"width\":\"735\",\"height\":\"249\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u0430\u043b\u0435\u0435 \u2013 \u0441\u043e\u0437\u0434\u0430\u0435\u0442\u0441\u044f \u0442\u0430\u0431\u043b\u0438\u0446\u0430 orders:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"731\" height=\"209\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/4-4.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2711\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/4-4.jpg 731w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/4-4-300x86.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/4-4-150x43.jpg 150w\" sizes=\"auto, (max-width: 731px) 100vw, 731px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/4-4.jpg\",\"width\":\"731\",\"height\":\"209\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0435\u043f\u0435\u0440\u044c \u043d\u0443\u0436\u043d\u043e joining \u043f\u043e\u043b\u044f \u0432 \u044d\u0442\u0438\u0445 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430\u0445 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0441\u0442\u044b\u043c \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c. \u0414\u043b\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0437\u0430\u0434\u0430\u0447\u0438 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u0430 \u0442\u0438\u043f\u0430:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>SELECT customers.customer_id,<br>orders.order_id,<br>orders.order_date<br>FROM customers<br>INNER JOIN orders<br>ON customers.customer_id = orders.customer_id<br>ORDER BY customers.customer_id;<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412 \u043a\u043e\u043d\u0435\u0447\u043d\u043e\u043c \u0438\u0442\u043e\u0433\u0435 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0432\u0435\u0434\u0435\u043d \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"628\" height=\"177\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/5-4.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2712\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/5-4.jpg 628w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/5-4-300x85.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/5-4-150x42.jpg 150w\" sizes=\"auto, (max-width: 628px) 100vw, 628px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/5-4.jpg\",\"width\":\"628\",\"height\":\"177\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0417\u0434\u0435\u0441\u044c \u0432\u044b\u0431\u0438\u0440\u0430\u044e\u0442\u0441\u044f \u043f\u043e\u043b\u044f \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0438\u043c\u0435\u044e\u0442 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f customer_id \u0432 \u043e\u0431\u043e\u0438\u0445 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430\u0445. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0434\u0440\u0443\u0433\u0438\u0435 \u043f\u043e\u043b\u044f \u0431\u0443\u0434\u0443\u0442 \u043f\u0440\u043e\u043f\u0443\u0449\u0435\u043d\u044b. \u0410 \u0441\u0442\u0440\u043e\u0447\u043a\u0430, \u0433\u0434\u0435 order_id = 5 \u0432 orders&nbsp; \u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442\u0441\u044f, \u0442\u0430\u043a \u043a\u0430\u043a customer_id \u0438\u0434\u0443\u0442 \u0441\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f\u043c\u0438 null. \u0422\u043e \u0435\u0441\u0442\u044c, \u0438\u0445 \u043d\u0435\u0442 \u0432 customers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Left Join<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0433\u043e \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f, left join \u2013 \u044d\u0442\u043e \u0432\u043e\u0437\u0432\u0440\u0430\u0442 \u0432\u0441\u0435\u0445 \u0441\u0442\u0440\u043e\u043a \u0438\u0437 \u043b\u0435\u0432\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u043f\u043e \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u043c \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0430\u043c. \u042d\u0442\u043e \u2013 \u043b\u0435\u0432\u043e\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0435\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u043c\u043e\u0435 \u0447\u0435\u0440\u0435\u0437 \u0443\u0441\u043b\u043e\u0432\u0438\u0435 ON. \u0412\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u043f\u0440\u043e\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043d\u0430 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0438\u0435 \u0443\u0441\u043b\u043e\u0432\u0438\u044f \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f;<\/li><li>\u0435\u0441\u043b\u0438 \u043e\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u2013 \u0441\u0442\u0440\u043e\u0447\u043a\u0430 \u0438\u0437 \u0432\u0442\u043e\u0440\u043e\u0439 \u043f\u0440\u0438\u0431\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043a \u043f\u0435\u0440\u0432\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u0435.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0418\u043c\u0435\u043d\u043d\u043e \u0442\u0430\u043a\u043e\u0435 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043c\u043e\u0436\u043d\u043e \u0434\u0430\u0442\u044c \u043a\u043e\u043c\u0430\u043d\u0434\u0435 left join. \u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0432 \u0435\u0433\u043e \u0432 \u0432\u0438\u0434\u0435 \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c, \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0437\u0430\u043f\u043e\u043c\u043d\u0438\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0435 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"454\" height=\"201\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/6-4.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2713\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/6-4.jpg 454w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/6-4-300x133.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/6-4-150x66.jpg 150w\" sizes=\"auto, (max-width: 454px) 100vw, 454px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/6-4.jpg\",\"width\":\"454\",\"height\":\"201\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u0441\u044f \u0437\u0430\u043a\u0440\u0430\u0448\u0435\u043d\u043d\u0430\u044f \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u2013 \u044d\u0442\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043a\u043e\u043c\u0430\u043d\u0434\u044b left join \u0432 \u044f\u0437\u044b\u043a\u0435 SQL.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0417\u0430\u043f\u0438\u0441\u044c \u0438 \u043f\u0440\u0438\u043c\u0435\u0440<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0423\u043a\u0430\u0437\u0430\u043d\u043d\u044b\u043c \u0440\u0430\u043d\u0435\u0435 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043e\u043c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0447\u0430\u0449\u0435 \u0432\u0441\u0435\u0433\u043e. \u041d\u043e \u0438\u043d\u043e\u0433\u0434\u0430, \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 \u0431\u043e\u043b\u044c\u0448\u0438\u043c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e\u043c \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u043b\u0435\u0432\u043e\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0435\u0435 \u00ab\u0441\u043b\u0438\u044f\u043d\u0438\u0435\u00bb. \u041e\u043d\u043e \u043e\u0431\u043b\u0430\u0434\u0430\u0435\u0442 \u0442\u0430\u043a\u043e\u0439 \u0444\u043e\u0440\u043c\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"474\" height=\"174\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/7-3.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2714\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/7-3.jpg 474w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/7-3-300x110.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/7-3-150x55.jpg 150w\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/7-3.jpg\",\"width\":\"474\",\"height\":\"174\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u041a\u043b\u044e\u0447\u0435\u0432\u043e\u0435 \u0441\u043b\u043e\u0432\u043e OUTER \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u0440\u043e\u043f\u0443\u0449\u0435\u043d\u043e. \u042d\u0442\u043e \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u044f\u0432\u043b\u0435\u043d\u0438\u0435, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u043c\u043e\u0435 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u043c\u0438 \u044f\u0437\u044b\u043a\u0430\u043c\u0438 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0441\u043e\u043a\u0440\u0430\u0442\u0438\u0442\u044c \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0439 \u043a\u043e\u0434 \u043f\u0440\u0438 \u0435\u0433\u043e \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u0438\u0438.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u0430 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0432\u0437\u044f\u0442\u044c \u0442\u0430\u0431\u043b\u0438\u0446\u0443 \u0441 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0435\u0439:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"727\" height=\"247\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/8-3.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2715\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/8-3.jpg 727w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/8-3-300x102.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/8-3-150x51.jpg 150w\" sizes=\"auto, (max-width: 727px) 100vw, 727px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/8-3.jpg\",\"width\":\"727\",\"height\":\"247\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u0442\u043e\u0440\u0430\u044f \u0431\u0430\u0437\u0430 \u0434\u0430\u043d\u043d\u044b\u0445:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"728\" height=\"212\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/9-2.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2716\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/9-2.jpg 728w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/9-2-300x87.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/9-2-150x44.jpg 150w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/9-2.jpg\",\"width\":\"728\",\"height\":\"212\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u044f \u0442\u0443\u0442 \u0431\u0443\u0434\u0443\u0442 \u0442\u0430\u043a\u0438\u043c\u0438 \u0436\u0435, \u043a\u0430\u043a \u0438 \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435. \u0422\u0435\u043f\u0435\u0440\u044c \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043b\u0435\u0432\u043e\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0435\u0433\u043e \u0441\u043b\u0438\u044f\u043d\u0438\u044f:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"731\" height=\"130\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/10-1.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2717\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/10-1.jpg 731w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/10-1-300x53.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/10-1-150x27.jpg 150w\" sizes=\"auto, (max-width: 731px) 100vw, 731px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/10-1.jpg\",\"width\":\"731\",\"height\":\"130\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u043e\u0441\u043b\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043d\u043e\u0433\u043e \u043d\u0430 \u044d\u043a\u0440\u0430\u043d\u0435 \u043f\u043e\u044f\u0432\u044f\u0442\u0441\u044f \u0432\u0441\u0435\u0433\u043e 6 \u0437\u0430\u043f\u0438\u0441\u0435\u0439:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"728\" height=\"248\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/11-1.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2718\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/11-1.jpg 728w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/11-1-300x102.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/11-1-150x51.jpg 150w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/11-1.jpg\",\"width\":\"728\",\"height\":\"248\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0430\u043a \u043f\u0440\u043e\u0438\u0437\u043e\u0448\u043b\u043e, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e left join \u043f\u0440\u043e\u0438\u0437\u0432\u0435\u043b \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0435 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u0441\u0442\u0440\u043e\u043a\u0438 customers \u0438 \u0442\u0435 \u0441\u0442\u0440\u043e\u0447\u043a\u0438 \u0438\u0437 orders, \u0433\u0434\u0435 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u043d\u044b\u0435 \u043f\u043e\u043b\u044f \u043e\u0431\u043b\u0430\u0434\u0430\u044e\u0442 \u0440\u0430\u0432\u043d\u044b\u043c\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f\u043c\u0438. \u0422\u0430\u043a\u0436\u0435 \u0441\u0442\u043e\u0438\u0442 \u0437\u0430\u043f\u043e\u043c\u043d\u0438\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u0432\u0430\u0436\u043d\u044b\u0435 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u043a\u043e\u0433\u0434\u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0432 customer_id \u0438\u0437 customers \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 orders, \u043f\u043e\u043b\u044f \u00ab\u043e\u0440\u0434\u0435\u0440\u0441\u00bb \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u044e\u0442\u0441\u044f \u0432 \u0432\u0438\u0434\u0435 null;<\/li><li>\u0435\u0441\u043b\u0438 \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0439 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u0441\u043b\u0438\u044f\u043d\u0438\u044f \u043d\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f, \u043f\u043e\u043b\u044f\/\u0441\u0442\u0440\u043e\u0447\u043a\u0438 \u00ab\u043e\u0442\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u044e\u0442\u0441\u044f\u00bb.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0438\u0447\u0435\u0433\u043e \u0442\u0440\u0443\u0434\u043d\u043e\u0433\u043e. \u0422\u0430\u043a\u043e\u0439 \u0442\u0438\u043f \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0442\u0430\u0431\u043b\u0438\u0447\u0435\u043a \u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 \u0438 \u0431\u0430\u0437\u0430\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 \u0442\u043e\u0436\u0435 \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u0435\u0442\u0441\u044f \u043d\u0435 \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0440\u0435\u0434\u043a\u043e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Right Join<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 right join \u043f\u0440\u0435\u0434\u0435\u043b\u044c\u043d\u043e \u043f\u0440\u043e\u0441\u0442\u043e\u0435 \u2013 \u043f\u0440\u0430\u0432\u043e\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0435\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. \u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u043e\u043c \u0431\u0443\u0434\u0443\u0442 \u0441\u043b\u0443\u0436\u0438\u0442\u044c \u0441\u0442\u0440\u043e\u0447\u043a\u0438 \u0438\u0437 \u0432\u0442\u043e\u0440\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u043c\u0443 \u0443\u0441\u043b\u043e\u0432\u0438\u044e \u0441\u043b\u0438\u044f\u043d\u0438\u044f. \u041d\u0430\u0433\u043b\u044f\u0434\u043d\u043e \u044d\u0442\u043e \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"468\" height=\"226\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/12-1.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2719\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/12-1.jpg 468w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/12-1-300x145.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/12-1-150x72.jpg 150w\" sizes=\"auto, (max-width: 468px) 100vw, 468px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/12-1.jpg\",\"width\":\"468\",\"height\":\"226\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u0438\u0441\u043a\u043b\u044e\u0447\u0430\u0435\u0442 \u043f\u043e\u043b\u044f \u043b\u0435\u0432\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b, \u043d\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u043c \u043f\u0440\u0438 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u043a\u0440\u0438\u0442\u0435\u0440\u0438\u044f\u043c.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u041e \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438 \u0438 \u043f\u0440\u0438\u043c\u0435\u0440\u0430\u0445<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0421\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441 \u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0431\u0443\u0434\u0435\u0442 \u0438\u043c\u0435\u0442\u044c \u0432\u0438\u0434:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"416\" height=\"175\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/13.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2720\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/13.jpg 416w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/13-300x126.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/13-150x63.jpg 150w\" sizes=\"auto, (max-width: 416px) 100vw, 416px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/13.jpg\",\"width\":\"416\",\"height\":\"175\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0427\u0442\u043e\u0431\u044b \u043f\u043e\u043d\u044f\u0442\u044c, \u043a\u0430\u043a \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 right join \u0432 \u044f\u0437\u044b\u043a\u0435 SQL, \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442\u0441\u044f \u043e\u0431\u0440\u0430\u0442\u0438\u0442\u044c \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u043d\u0430\u0433\u043b\u044f\u0434\u043d\u044b\u0439 \u043f\u0440\u0438\u043c\u0435\u0440. \u041e\u043d \u043e\u043f\u044f\u0442\u044c \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441 \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0430\u043c\u0438 customer \u0438 orders. \u041f\u0440\u0438\u043c\u0435\u0440 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u043e\u043f\u0438\u0441\u0430\u043d \u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u0435 SELECT.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u0430\u043d\u044b \u0434\u0432\u0435 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0441 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0435\u0439:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"724\" height=\"249\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/14.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2721\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/14.jpg 724w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/14-300x103.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/14-150x52.jpg 150w\" sizes=\"auto, (max-width: 724px) 100vw, 724px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/14.jpg\",\"width\":\"724\",\"height\":\"249\"}<\/script><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"725\" height=\"213\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/15.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2722\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/15.jpg 725w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/15-300x88.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/15-150x44.jpg 150w\" sizes=\"auto, (max-width: 725px) 100vw, 725px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/15.jpg\",\"width\":\"725\",\"height\":\"213\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u0430\u043b\u0435\u0435, \u0447\u0442\u043e\u0431\u044b joined \u0434\u0432\u0435 \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0438 \u043f\u043e \u043f\u0440\u0430\u0432\u043e\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0435\u043c\u0443 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0443, \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043e\u0442\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0439 \u0437\u0430\u043f\u0440\u043e\u0441. \u041e\u043d \u043e\u0431\u043b\u0430\u0434\u0430\u0435\u0442 \u0442\u0430\u043a\u043e\u0439 \u0444\u043e\u0440\u043c\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"727\" height=\"132\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/16.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2723\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/16.jpg 727w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/16-300x54.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/16-150x27.jpg 150w\" sizes=\"auto, (max-width: 727px) 100vw, 727px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/16.jpg\",\"width\":\"727\",\"height\":\"132\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u041a\u0430\u043a \u0442\u043e\u043b\u044c\u043a\u043e \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f \u043f\u0440\u043e\u0439\u0434\u0435\u0442 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443, \u043d\u0430 \u044d\u043a\u0440\u0430\u043d\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \u043f\u043e\u044f\u0432\u0438\u0442\u0441\u044f \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442. \u041e\u043d \u0431\u0443\u0434\u0435\u0442 \u0441\u043e\u0441\u0442\u043e\u044f\u0442\u044c \u0438\u0437 \u043f\u044f\u0442\u0438 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"732\" height=\"213\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/17.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2724\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/17.jpg 732w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/17-300x87.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/17-150x44.jpg 150w\" sizes=\"auto, (max-width: 732px) 100vw, 732px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/17.jpg\",\"width\":\"732\",\"height\":\"213\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0417\u0434\u0435\u0441\u044c:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442\u0441\u044f \u0441\u0442\u0440\u043e\u043a\u0438 \u0438\u0437 orders \u2013 \u0432\u0441\u0435;<\/li><li>\u043d\u0430 \u044d\u043a\u0440\u0430\u043d \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0432\u044b\u0432\u043e\u0434\u044f\u0442\u0441\u044f \u0441\u0442\u0440\u043e\u0447\u043a\u0438 \u0438\u0437 customers, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0438\u043c\u0435\u044e\u0442 \u0441 \u00ab\u043e\u0440\u0434\u0435\u0440\u0441\u00bb \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f;<\/li><li>\u0435\u0441\u043b\u0438 customers_id \u0432 orders \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u00ab\u043a\u0430\u0441\u0442\u043e\u043c\u0435\u0440\u0441\u00bb, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u043f\u043e\u043b\u044f \u0438\u043c\u0435\u044e\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 null.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u043e \u0438 \u044d\u0442\u043e \u0435\u0449\u0435 \u043d\u0435 \u0432\u0441\u0435. \u0414\u043b\u044f \u043f\u043e\u043b\u043d\u043e\u0433\u043e \u043e\u0441\u043e\u0437\u043d\u0430\u043d\u0438\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0441\u043b\u0438\u044f\u043d\u0438\u044f \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u044b\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u0432, \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0432 \u043f\u0435\u0440\u0432\u0443\u044e \u043e\u0447\u0435\u0440\u0435\u0434\u044c \u0438\u0437\u0443\u0447\u0438\u0442\u044c \u0432\u0441\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u0435 \u0440\u0430\u0441\u043a\u043b\u0430\u0434\u044b. \u0418\u0445 \u043e\u0441\u0442\u0430\u043b\u043e\u0441\u044c \u0435\u0449\u0435 2. \u0412\u0441\u0442\u0440\u0435\u0447\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 \u043d\u0435 \u0441\u043b\u0438\u0448\u043a\u043e\u043c \u0447\u0430\u0441\u0442\u043e, \u0438\u0437-\u0437\u0430 \u0447\u0435\u0433\u043e \u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0442 \u043d\u0435\u043c\u0430\u043b\u044b\u0435 \u0445\u043b\u043e\u043f\u043e\u0442\u044b. \u041e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u0442\u0435\u043c, \u043a\u0442\u043e \u0437\u0430\u043d\u0438\u043c\u0430\u0435\u0442\u0441\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432\u044b\u043c \u044f\u0437\u044b\u043a\u043e\u043c \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043d\u0435\u0434\u0430\u0432\u043d\u043e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u041f\u043e \u043f\u043e\u043b\u043d\u043e\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0435<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0440\u0435\u0434\u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u0435\u0434\u0443\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442 join \u0432 \u044f\u0437\u044b\u043a\u0435 SQL \u2013 \u044d\u0442\u043e full. \u041c\u043e\u0436\u043d\u043e \u043d\u0430\u0437\u0432\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435\u043c \u0435\u0434\u0438\u043d\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b. \u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f\u0445 \u0438\u0437 \u043e\u0431\u0435\u0438\u0445 \u0411\u0414 \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0432\u0435\u0434\u0435\u043d\u0430 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d. \u0417\u0434\u0435\u0441\u044c \u043d\u0435 \u0432\u0430\u0436\u043d\u043e, \u0433\u0434\u0435 \u0438\u043c\u0435\u043d\u043d\u043e \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0435\u043f\u043e\u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u043f\u0435\u0440\u0435\u0441\u0435\u0447\u0435\u043d\u0438\u0435 \u043f\u043e\u043b\u0435\u0439.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0440\u0438 full join \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043d\u0430 \u043d\u0435\u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0443\u0441\u043b\u043e\u0432\u0438\u044f;<\/li><li>\u0432\u044b\u0432\u043e\u0434 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d \u0432\u0441\u0435\u0445 \u0441\u0442\u0440\u043e\u0447\u0435\u043a \u0438\u0437 \u043b\u0435\u0432\u043e\u0439 \u0438 \u043f\u0440\u0430\u0432\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446 \u0441\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f\u043c\u0438 null, \u043a\u043e\u0433\u0434\u0430 \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u043d\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043e.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u044d\u0442\u043e \u0442\u0430\u043a:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"385\" height=\"206\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/18.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2725\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/18.jpg 385w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/18-300x161.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/18-150x80.jpg 150w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/18.jpg\",\"width\":\"385\",\"height\":\"206\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0415\u0441\u043b\u0438 \u0433\u043e\u0432\u043e\u0440\u0438\u0442\u044c \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u044f\u0437\u044b\u043a\u043e\u043c, \u0432\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0437\u0430\u043f\u0440\u043e\u0441\u0430 \u043f\u0440\u043e\u0438\u0437\u043e\u0439\u0434\u0435\u0442 \u0441\u043b\u0438\u044f\u043d\u0438\u0435 \u0434\u0432\u0443\u0445 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432. \u041d\u0430 \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c\u0435 \u0432\u0438\u0434\u0435\u043d \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u2013 \u044d\u0442\u043e \u0437\u0430\u043a\u0440\u0430\u0448\u0435\u043d\u043d\u0430\u044f \u043e\u0431\u043b\u0430\u0441\u0442\u044c.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u041a\u0430\u043a \u0437\u0430\u043f\u0438\u0441\u044b\u0432\u0430\u0442\u044c \u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0424\u043e\u0440\u043c\u0430 \u0437\u0430\u043f\u0438\u0441\u0438 \u043e\u043a\u0430\u0436\u0435\u0442\u0441\u044f \u0442\u0430\u043a\u043e\u0433\u043e \u0442\u0438\u043f\u0430:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"421\" height=\"179\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/19.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2726\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/19.jpg 421w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/19-300x128.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/19-150x64.jpg 150w\" sizes=\"auto, (max-width: 421px) 100vw, 421px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/19.jpg\",\"width\":\"421\",\"height\":\"179\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Full \u2013 \u044d\u0442\u043e \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0432\u0441\u0435\u0445 \u043f\u043e\u043b\u0435\u0439 \u0432 \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0430\u0445 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0431\u0430\u0437 \u0434\u0430\u043d\u043d\u044b\u0445. \u0414\u043b\u044f \u0442\u043e\u0433\u043e, \u0447\u0442\u043e\u0431\u044b \u043d\u0430\u043c\u043d\u043e\u0433\u043e \u043b\u0443\u0447\u0448\u0435 \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u0432 \u044d\u0442\u043e\u043c \u0432\u043e\u043f\u0440\u043e\u0441\u0435, \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0438:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"245\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/20.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2727\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/20.jpg 721w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/20-300x102.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/20-150x51.jpg 150w\" sizes=\"auto, (max-width: 721px) 100vw, 721px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/20.jpg\",\"width\":\"721\",\"height\":\"245\"}<\/script><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"724\" height=\"216\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/21.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2728\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/21.jpg 724w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/21-300x90.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/21-150x45.jpg 150w\" sizes=\"auto, (max-width: 724px) 100vw, 724px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/21.jpg\",\"width\":\"724\",\"height\":\"216\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u041e\u043d\u0438 \u043d\u0430\u0437\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u0442\u0430\u043a \u0436\u0435, \u043a\u0430\u043a \u0438 \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u043b \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0439 \u043d\u0430\u0433\u043b\u044f\u0434\u043d\u044b\u0439 \u043f\u0440\u0438\u043c\u0435\u0440. \u0417\u0430\u043f\u0440\u043e\u0441 \u043e\u0431\u043b\u0430\u0434\u0430\u0435\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u0432\u0438\u0434\u043e\u043c:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"434\" height=\"183\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/22.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2729\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/22.jpg 434w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/22-300x126.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/22-150x63.jpg 150w\" sizes=\"auto, (max-width: 434px) 100vw, 434px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/22.jpg\",\"width\":\"434\",\"height\":\"183\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0418\u0442\u043e\u0433:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"727\" height=\"280\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/23.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2730\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/23.jpg 727w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/23-300x116.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/23-150x58.jpg 150w\" sizes=\"auto, (max-width: 727px) 100vw, 727px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/23.jpg\",\"width\":\"727\",\"height\":\"280\"}<\/script><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u041f\u0435\u0440\u0435\u043a\u0440\u0435\u0441\u0442\u043d\u044b\u043c \u0442\u0438\u043f\u043e\u043c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0415\u0449\u0435 \u043e\u0434\u0438\u043d \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b\u0439 \u043f\u043e\u0434\u0445\u043e\u0434, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u043c \u2013 \u044d\u0442\u043e cross. \u041d\u0430\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u0435\u0440\u0435\u043a\u0440\u0435\u0441\u0442\u043d\u044b\u043c. \u0418\u043d6\u043e\u0433\u0434\u0430 \u2013 \u0434\u0435\u043a\u0430\u0440\u0442\u043e\u0432\u043e. \u041f\u0440\u0438 \u0435\u0433\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044f \u0442\u043e\u0433\u043e \u0436\u0435 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430, \u0447\u0442\u043e \u0438 \u043f\u0440\u0438 \u0432\u044b\u0437\u043e\u0432\u0435 \u0434\u0432\u0443\u0445 \u0442\u0430\u0431\u043b\u0438\u0446 \u0431\u0435\u0437 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u044b. \u042d\u0442\u043e \u0437\u043d\u0430\u0447\u0438\u0442, \u0447\u0442\u043e:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u043d\u0430 \u044d\u043a\u0440\u0430\u043d\u0435 \u043f\u043e\u044f\u0432\u0438\u0442\u0441\u044f \u0438\u0442\u043e\u0433 \u0441\u043b\u0438\u044f\u043d\u0438\u044f \u043f\u0435\u0440\u0432\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0438 \u0432\u0442\u043e\u0440\u043e\u0439;<\/li><li>\u043a\u0430\u0436\u0434\u0430\u044f \u0437\u0430\u043f\u0438\u0441\u044c \u043e\u0434\u043d\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0431\u0443\u0434\u0435\u0442 \u0434\u0443\u0431\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043f\u043e\u043b\u044f \u0438\u0437 \u0434\u0440\u0443\u0433\u043e\u0439.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0430\u043a, \u0435\u0441\u043b\u0438 \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u04351 a \u0437\u0430\u043f\u0438\u0441\u0435\u0439, \u0430 \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u04352 b, \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0438\u0440\u0443\u044e\u0449\u0435\u0439 \u043e\u043a\u0430\u0436\u0435\u0442\u0441\u044f \u0442\u0430\u0431\u043b\u0438\u0446\u0430 a x b \u043f\u043e\u043b\u0435\u0439. \u0412 \u0432\u0438\u0434\u0435 \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c\u044b \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0442\u0438\u0447\u043d\u043e. \u041e\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0437\u0430\u043f\u0443\u0442\u0430\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041e\u0431\u043b\u0430\u0434\u0430\u0435\u0442 \u0437\u0430\u043f\u0440\u043e\u0441 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0441\u043e\u043c:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"350\" height=\"100\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/24.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2731\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/24.jpg 350w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/24-300x86.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/24-150x43.jpg 150w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/24.jpg\",\"width\":\"350\",\"height\":\"100\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u043d\u0438\u043c\u0430\u043d\u0438\u0435: cross join \u2013 \u044d\u0442\u043e \u0434\u0435\u043a\u0430\u0440\u0442\u043e\u0432\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0434\u0435\u043d\u0438\u0435. \u0422\u0430\u043a \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u043e\u0449\u0435 \u043f\u043e\u043d\u044f\u0442\u044c, \u043e \u0447\u0435\u043c \u0438\u0434\u0435\u0442 \u0440\u0435\u0447\u044c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u041a\u043e\u043c\u0431\u0438\u043d\u0430\u0446\u0438\u0438<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u0442\u043e\u0433\u043e, \u0447\u0442\u043e\u0431\u044b \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u0442\u044c \u043f\u0430\u0440\u044b \u0442\u0430\u0431\u043b\u0438\u0447\u0435\u043a, \u043c\u043e\u0436\u043d\u043e \u0432\u043e\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f self join. \u0427\u0442\u043e\u0431\u044b \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u0432 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0430\u0445 \u0440\u0430\u0431\u043e\u0442\u044b \u0437\u0430\u043f\u0440\u043e\u0441\u0430, \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043f\u0440\u0438\u043c\u0435\u0440. \u0421\u0430\u043c \u0437\u0430\u043f\u0440\u043e\u0441 \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"422\" height=\"102\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/25.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2732\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/25.jpg 422w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/25-300x73.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/25-150x36.jpg 150w\" sizes=\"auto, (max-width: 422px) 100vw, 422px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/25.jpg\",\"width\":\"422\",\"height\":\"102\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0410 \u0438\u0442\u043e\u0433:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"208\" height=\"174\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/26.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2733\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/26.jpg 208w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/26-150x125.jpg 150w\" sizes=\"auto, (max-width: 208px) 100vw, 208px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/26.jpg\",\"width\":\"208\",\"height\":\"174\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0442\u0430\u043a\u043e\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432 \u043d\u0430\u0433\u043b\u044f\u0434\u043d\u043e \u0442\u043e\u0436\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0442\u0438\u0447\u043d\u043e. \u0417\u0430\u0442\u043e \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u2013 \u043d\u0435\u0442. \u0422\u0443\u0442 \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u043e, \u0447\u0442\u043e \u0443 \u0413\u0430\u0440\u0440\u0438 \u043d\u0435\u0442 \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u0438\u043a\u0430.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0418\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u041f\u043e\u0441\u043b\u0435 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0438\u044f \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438 \u0434\u0440\u0443\u0433\u043e\u0433\u043e \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0432 \u044f\u0437\u044b\u043a\u0435 SQL, \u0432\u0430\u0436\u043d\u043e \u043d\u0435 \u0437\u0430\u0431\u044b\u0432\u0430\u0442\u044c \u043e\u0431 \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438. \u0420\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u043e\u043c \u0431\u0443\u0434\u0443\u0442 \u0434\u0430\u043d\u043d\u044b\u0435 \u0438\u0437 \u043f\u0435\u0440\u0432\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0446\u044b, \u043d\u043e \u0438\u0441\u043a\u043b\u044e\u0447\u0430\u044f \u043f\u043e\u043b\u044f, \u0441\u043e\u0432\u043f\u0430\u0434\u0430\u044e\u0449\u0438\u0435 \u0441\u043e \u0432\u0442\u043e\u0440\u043e\u0439 \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u043e\u0439. \u041d\u0430\u0433\u043b\u044f\u0434\u043d\u043e \u044d\u0442\u043e \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0442\u0430\u043a:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"462\" height=\"209\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/27.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2734\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/27.jpg 462w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/27-300x136.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/27-150x68.jpg 150w\" sizes=\"auto, (max-width: 462px) 100vw, 462px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/27.jpg\",\"width\":\"462\",\"height\":\"209\"}<\/script><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0427\u0442\u043e\u0431\u044b \u0432\u043e\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u043c \u043f\u0440\u0438\u0435\u043c\u043e\u043c, \u043d\u0435 \u043d\u0443\u0436\u043d\u043e \u0437\u043d\u0430\u0442\u044c \u043d\u0438 \u0434\u0435\u043a\u0430\u0440\u0442\u043e\u0432\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0434\u0435\u043d\u0438\u0435, \u043d\u0438 \u043a\u0430\u043a\u0438\u0435-\u0442\u043e \u0434\u0440\u0443\u0433\u0438\u0435 \u0441\u043b\u043e\u0436\u043d\u044b\u0435 \u043f\u043e\u043d\u044f\u0442\u0438\u044f. \u0412 \u0437\u0430\u043f\u0440\u043e\u0441 \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 Where.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0410 \u0432\u043e\u0442 \u043f\u0440\u0438\u043c\u0435\u0440 \u0437\u0430\u043f\u0438\u0441\u0438 \u043a\u043e\u043c\u0430\u043d\u0434\u044b:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"359\" height=\"126\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/28.jpg\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2735\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/28.jpg 359w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/28-300x105.jpg 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/28-150x53.jpg 150w\" sizes=\"auto, (max-width: 359px) 100vw, 359px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/28.jpg\",\"width\":\"359\",\"height\":\"126\"}<\/script><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u041f\u043b\u0430\u043d\u044b \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u0442\u043e\u0433\u043e, \u0447\u0442\u043e\u0431\u044b \u0433\u0440\u0430\u043c\u043e\u0442\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c join \u0432 SQL, \u043d\u0443\u0436\u043d\u043e \u0443\u0447\u0438\u0442\u044b\u0432\u0430\u0442\u044c \u043f\u043b\u0430\u043d\u044b \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u0422\u043e, \u043a\u0430\u043a \u0438\u043c\u0435\u043d\u043d\u043e (\u0432 \u043a\u0430\u043a\u043e\u0439 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438) \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440\u043e\u0432 \u0438 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0435 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041e\u0447\u0435\u0440\u0435\u0434\u043d\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0430\u044f:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>from;<\/li><li>join;<\/li><li>where.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u0430\u043d\u043d\u044b\u0439 \u043f\u0440\u0438\u043d\u0446\u0438\u043f \u0430\u043a\u0442\u0443\u0430\u043b\u0435\u043d \u0434\u043b\u044f \u0432\u0441\u0435\u0445 \u0421\u0423\u0411\u0414. \u0415\u0441\u043b\u0438 \u043d\u0435 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0442\u044c \u0435\u0433\u043e \u0432\u043e \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435, \u043c\u043e\u0436\u043d\u043e \u0432 \u043a\u043e\u043d\u0435\u0447\u043d\u043e\u043c \u0438\u0442\u043e\u0433\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0438 \u0441 \u043d\u0435\u0432\u0435\u0440\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0435\u0439.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412\u0430\u0436\u043d\u043e: \u0434\u043b\u044f \u0442\u043e\u0433\u043e, \u0447\u0442\u043e\u0431\u044b \u0443\u0441\u043a\u043e\u0440\u0438\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0443 \u043a\u043e\u043c\u0430\u043d\u0434, \u0432\u0430\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u043d\u044b\u0435 \u0438\u043d\u0434\u0435\u043a\u0441\u044b. \u041e\u043d\u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f Server Query Optimizer \u0434\u043b\u044f \u043e\u0431\u0435\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0446. \u0410\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u043d\u044b\u0445 \u0438\u043d\u0434\u0435\u043a\u0441\u043e\u0432 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u0434\u043b\u044f \u043f\u0435\u0440\u0432\u0438\u0447\u043d\u044b\u0445 \u043a\u043b\u044e\u0447\u0435\u0439. \u0421 \u043e\u0441\u0442\u0430\u043b\u044c\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u0434\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0443\u044e \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0443.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 join \u0432 \u044f\u0437\u044b\u043a\u0435 SQL \u043d\u0435 \u0434\u043e\u043b\u0436\u043d\u043e \u0432\u044b\u0437\u044b\u0432\u0430\u0442\u044c \u0432\u043e\u043f\u0440\u043e\u0441\u043e\u0432. \u0410 \u0435\u0441\u043b\u0438 \u0445\u043e\u0447\u0435\u0442\u0441\u044f \u043b\u0443\u0447\u0448\u0435 \u043f\u043e\u043d\u044f\u0442\u044c, \u0447\u0442\u043e \u044d\u0442\u043e \u0442\u0430\u043a\u043e\u0435, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c\u0441\u044f \u0432 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0430\u0445 \u0440\u0430\u0431\u043e\u0442\u044b queries, \u0441\u0442\u043e\u0438\u0442 \u043f\u043e\u0441\u0435\u0442\u0438\u0442\u044c \u0434\u0438\u0441\u0442\u0430\u043d\u0446\u0438\u043e\u043d\u043d\u044b\u0435 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043a\u0443\u0440\u0441\u044b. \u041f\u043e \u043e\u043a\u043e\u043d\u0447\u0430\u043d\u0438\u044e \u043e\u0431\u0443\u0447\u0435\u043d\u0438\u044f \u0432\u044b\u0434\u0430\u0435\u0442\u0441\u044f \u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442, \u043f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0430\u044e\u0449\u0438\u0439 \u0437\u043d\u0430\u043d\u0438\u044f \u0438 \u043d\u0430\u0432\u044b\u043a\u0438 \u0432 \u0432\u044b\u0431\u0440\u0430\u043d\u043d\u043e\u043c \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0438.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/otus.ru\/lessons\/subd\/?utm_source=oj&amp;utm_medium=affilate&amp;utm_campaign=subd\"><img loading=\"lazy\" decoding=\"async\" width=\"970\" height=\"90\" src=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/SUBD_970x90-20219-543a9a.png\" alt=\"\u041e\u0441\u043d\u043e\u0432\u044b SQL: \u0440\u0430\u0431\u043e\u0442\u0430 \u0441 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438 \u0438 \u0438\u0445 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u043c\" class=\"wp-image-2707\" srcset=\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/SUBD_970x90-20219-543a9a.png 970w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/SUBD_970x90-20219-543a9a-300x28.png 300w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/SUBD_970x90-20219-543a9a-150x14.png 150w, https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/SUBD_970x90-20219-543a9a-768x71.png 768w\" sizes=\"auto, (max-width: 970px) 100vw, 970px\" \/><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"ImageObject\",\"url\":\"https:\/\/otus.ru\/journal\/wp-content\/uploads\/2022\/01\/SUBD_970x90-20219-543a9a.png\",\"width\":\"970\",\"height\":\"90\"}<\/script><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0411\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u2013 \u0442\u043e, \u0447\u0442\u043e \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0431\u0438\u0437\u043d\u0435\u0441\u0443, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0433\u043e\u0441\u0443\u0434\u0430\u0440\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u043c \u043e\u0440\u0433\u0430\u043d\u0430\u043c \u0438 \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u044f\u0442\u0438\u044f\u043c. \u042d\u0442\u043e \u2013 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u0420\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441 \u043d\u0438\u043c\u0438 \u0434\u043e\u043b\u0436\u0435\u043d \u0443\u043c\u0435\u0442\u044c \u043a\u0430\u0436\u0434\u044b\u0439, \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u043a\u043e\u0433\u0434\u0430 \u0440\u0435\u0447\u044c \u0437\u0430\u0445\u043e\u0434\u0438\u0442 \u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438. \u0412 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0411\u0414 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c\u0438. \u0421 \u043d\u0438\u043c\u0438 \u0441\u043e\u0432\u0435\u0440\u0448\u0430\u044e\u0442 \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u043d\u044b\u0435 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f: \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u044f\u044e\u0442 \u0442\u0435\u043c \u0438\u043b\u0438 \u0438\u043d\u044b\u043c \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u043c; \u0443\u0434\u0430\u043b\u044f\u044e\u0442; \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0442; \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u044e\u0442; \u0432\u044b\u0432\u043e\u0434\u044f\u0442 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d. \u0414\u0435\u043b\u0430\u0435\u0442\u0441\u044f \u044d\u0442\u043e \u0438\u043b\u0438 \u043f\u043e\u0441\u0440\u0435\u0434\u0441\u0442\u0432\u043e\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0433\u043e [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":2706,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[162,38],"class_list":["post-2705","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-polza","tag-join","tag-sql"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0411\u0430\u0437\u044b \u0434\u0430\u043d\u043d\u044b\u0445 \u2013 \u0442\u043e, \u0447\u0442\u043e \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0431\u0438\u0437\u043d\u0435\u0441\u0443, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0433\u043e\u0441\u0443\u0434\u0430\u0440\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u043c \u043e\u0440\u0433\u0430\u043d\u0430\u043c \u0438 \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u044f\u0442\u0438\u044f\u043c. \u042d\u0442\u043e \u2013 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