{"id":786,"date":"2024-05-07T12:26:55","date_gmt":"2024-05-07T09:26:55","guid":{"rendered":"https:\/\/aristov.tech\/blog\/?p=786"},"modified":"2024-05-07T12:28:14","modified_gmt":"2024-05-07T09:28:14","slug":"skazhem-net-diagrammam-venna-dlya-dzhojnov","status":"publish","type":"post","link":"https:\/\/aristov.tech\/blog\/skazhem-net-diagrammam-venna-dlya-dzhojnov\/","title":{"rendered":"\u0421\u043a\u0430\u0436\u0435\u043c \u043d\u0435\u0442 \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c\u0430\u043c \u0412\u0435\u043d\u043d\u0430 \u0434\u043b\u044f SQL \u0434\u0436\u043e\u0439\u043d\u043e\u0432"},"content":{"rendered":"\n

\u0421\u0442\u0430\u0442\u044c\u044f \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u0432 \u0440\u0444 \u0441\u0442\u0430\u0442\u044c\u0435<\/a>. <\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u041d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 2016 \u0433\u043e\u0434\u0430 \u0438\u0434\u0451\u0442 \u0432\u043e\u043b\u043d\u0430, \u0447\u0442\u043e\u0431\u044b \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0414\u0438\u0430\u0433\u0440\u0430\u043c\u043c \u0412\u0435\u043d\u043d\u0430<\/a> (\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432) \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f SQL \u0434\u0436\u043e\u0439\u043d\u043e\u0432. \u0417\u0430\u0431\u0438\u0432 \u0432 \u043f\u043e\u0438\u0441\u043a\u043e\u0432\u0438\u043a \u0434\u0436\u043e\u0439\u043d\u044b, \u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0443\u044e \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0443:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u0427\u0442\u043e \u043c\u0435\u043d\u044f \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0440\u0430\u0437\u0434\u0440\u0430\u0436\u0430\u0435\u0442, \u0442\u0430\u043a \u044d\u0442\u043e \u0442\u043e, \u0447\u0442\u043e \u0432\u0441\u044f \u044d\u0442\u0430 \u0441\u043c\u0435\u0441\u044c JOIN \u0438 \u0442\u0435\u043e\u0440\u0438\u0438 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432 \u0434\u0430\u0436\u0435 \u043d\u0435 \u0438\u043c\u0435\u0435\u0442 \u0441\u043c\u044b\u0441\u043b\u0430. \u041a\u0430\u043a \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u0430\u0448\u0435 \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u0435 \u0434\u043e\u043b\u0436\u043d\u043e \u0431\u0443\u0434\u0435\u0442 \u0432\u043a\u043b\u044e\u0447\u0430\u0442\u044c \u0444\u0440\u0430\u0437\u0443 \u00ab\u0413\u0414\u0415 A \u0440\u0430\u0432\u043d\u043e NULL\u00bb \u0432, \u043a\u0430\u0437\u0430\u043b\u043e\u0441\u044c \u0431\u044b, \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0445 \u043c\u0435\u0441\u0442\u0430\u0445, \u043b\u044e\u0434\u0438 \u043f\u043e\u0434\u0443\u043c\u0430\u044e\u0442, \u0447\u0442\u043e \u0432\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0437\u0430\u043f\u043e\u043c\u0438\u043d\u0430\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u044b\u0435 \u0437\u0430\u043a\u043b\u0438\u043d\u0430\u043d\u0438\u044f, \u0447\u0442\u043e\u0431\u044b \u0437\u0430\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0432\u0441\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u2014 \u0447\u0442\u043e \u043f\u043e \u043f\u0440\u0430\u0432\u0443 \u0437\u0432\u0443\u0447\u0438\u0442 \u0422\u042f\u0416\u0415\u041b\u041e!<\/p>\n\n\n\n

\u041a\u043e\u0440\u043d\u0438 SQL \u043b\u0435\u0436\u0430\u0442 \u0432 \u0440\u0435\u043b\u044f\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0430\u043b\u0433\u0435\u0431\u0440\u0435, \u0430 \u043d\u0435 \u0432 \u0442\u0435\u043e\u0440\u0438\u0438 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432. \u0424\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438, \u0442\u043e, \u043a\u0430\u043a \u044f \u043e\u0431\u044a\u044f\u0441\u043d\u044f\u044e \u0432\u0435\u0449\u0438 \u043b\u044e\u0434\u044f\u043c, \u0434\u0430\u0435\u0442 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442, \u043d\u043e, \u043f\u043e-\u0432\u0438\u0434\u0438\u043c\u043e\u043c\u0443, \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0432 \u043e\u0431\u0440\u0430\u0442\u043d\u043e\u043c \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u043e\u0442 \u0444\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0441\u043f\u043e\u0441\u043e\u0431\u0430.<\/p>\n\n\n\n

\u0417\u0434\u0435\u0441\u044c \u0438 \u0434\u0430\u043b\u0435\u0435 \u043f\u0440\u0438\u043c\u0435\u0440\u044b \u0430\u0432\u0442\u043e\u0440\u0430 \u043f\u043e \u0432\u044b\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0439 \u0432\u0441\u0435\u043b\u0435\u043d\u043d\u043e\u0439 \u0441 \u0413\u043e\u0434\u0437\u0438\u043b\u043b\u043e\u0439.<\/p>\n\n\n\n

\u0411\u0443\u0434\u0435\u043c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c 2 \u0442\u0430\u0431\u043b\u0438\u0446\u044b:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u0413\u0434\u0435 \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u0410 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u043d\u043e\u0441\u0442\u044c \u0433\u043e\u0440\u043e\u0434\u0430 \u0441\u0442\u0440\u0430\u043d\u0435, \u0430 \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u0411, \u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0440\u0430\u0437 \u0413\u043e\u0434\u0437\u0438\u043b\u043b\u0430 \u0430\u0442\u0430\u043a\u043e\u0432\u0430\u043b\u0430 \u0433\u043e\u0440\u043e\u0434.<\/p>\n\n\n\n

\u0422\u0435\u043e\u0440\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044f JOIN \u0432\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:<\/p>\n\n\n\n

Select _fields_<\/em>
FROM A
JOIN B ON on_conditions
<\/em>WHERE where_conditions<\/em><\/pre>\n\n\n\n
\u0418\u0442\u043e\u0433\u043e \u0432 \u0431\u043b\u043e\u043a\u0435 select \u043c\u044b \u043f\u0435\u0440\u0435\u0447\u0438\u0441\u043b\u044f\u0435\u043c \u043f\u043e\u043b\u044f \u0438\u0437 \u043e\u0434\u043d\u043e\u0439 \u0438\u043b\u0438 \u0434\u0432\u0443\u0445 \u0442\u0430\u0431\u043b\u0438\u0446, \u0437\u0430\u0434\u0430\u0435\u043c \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0432 ON (\u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u043e\u043c \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044f \u0434\u043e\u043b\u0436\u043d\u043e \u0431\u044b\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 boolean<\/a> — true\/false) \u0438 \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c \u0444\u0438\u043b\u044c\u0442\u0440 \u0434\u043b\u044f \u0438\u0442\u043e\u0433\u043e\u0432\u043e\u0439 \u0432\u044b\u0431\u043e\u0440\u043a\u0438 (\u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0434\u0430\/\u043d\u0435\u0442).<\/p>\n\n\n\n
\u041f\u0440\u043e\u0441\u0442\u0435\u0439\u0448\u0438\u0439 \u0437\u0430\u043f\u0440\u043e\u0441 \u043d\u0430 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u044d\u0442\u0438\u0445 \u0442\u0430\u0431\u043b\u0438\u0446 (INNER JOIN) \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:<\/p>\n\n\n\n
SELECT A.City_name, Godzilla_attacks
from A
JOIN B on A.City_name = B.City_name<\/pre>\n\n\n\n
\u0418 \u0442\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u043c\u044b \u0431\u0443\u0434\u0435\u043c \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0442\u044c \u043f\u043e\u0441\u0442\u0440\u043e\u0447\u043d\u043e \u0432\u0441\u0435 \u0441\u0442\u0440\u043e\u043a\u0438 \u0438\u0437 \u0442\u0430\u0431\u043b\u0438\u0446 \u0410 \u0438 \u0412. \u0413\u0434\u0435 \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043e, \u043e\u043d\u0438 \u043f\u043e\u043f\u0430\u0434\u0443\u0442 \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u043d\u0430\u0431\u043e\u0440. \u041a\u043e\u0433\u0434\u0430 \u043f\u0435\u0440\u0435\u0431\u043e\u0440 \u0431\u0443\u0434\u0435\u0442 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d, \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u043d\u0430\u0431\u043e\u0440 \u0432\u0435\u0440\u043d\u0435\u0442\u0441\u044f \u043a \u043d\u0430\u043c \u0434\u043b\u044f \u0434\u0430\u043b\u044c\u043d\u0435\u0439\u0448\u0435\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438.<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u0421\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u044b\u0439 \u0434\u0436\u043e\u0439\u043d — LEFT JOIN (\u0430 \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u044d\u0442\u0438 \u0434\u0432\u0430 \u0434\u0436\u043e\u0439\u043d\u0430 \u0438 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0442 99,9% \u043f\u0440\u043e\u0446\u0435\u043d\u0442\u043e\u0432 \u0432\u0441\u0435\u0445 \u0434\u0436\u043e\u0439\u043d\u043e\u0432), \u0431\u0443\u0434\u0435\u0442 \u0432\u044b\u0433\u043b\u044f\u0434\u0435\u0442\u044c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c:<\/p>\n\n\n\n
SELECT A.City_name, Godzilla_attacks 
from A LEFT 
JOIN B on A.City_name = B.City_name<\/pre>\n\n\n\n
\u0412 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0435 \u0437\u0430\u043f\u0440\u043e\u0441 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u0435\u043d \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u043c\u0443, \u043a\u0440\u043e\u043c\u0435 \u0441\u043b\u0443\u0447\u0430\u044f \u043d\u0435\u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f \u0441\u0442\u0440\u043e\u043a\u0438 \u0438\u0437 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0410 \u0438 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0412 — \u0442\u043e\u0433\u0434\u0430 \u0432 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u043d\u0430\u0431\u043e\u0440 \u0431\u0443\u0434\u0443\u0442 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u044b \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u0438\u0437 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0410 \u0438 \u043f\u0443\u0441\u0442\u044b\u0435 (NULL) \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043f\u043e \u0448\u0430\u0431\u043b\u043e\u043d\u0443 \u0438\u0437 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \u0412. \u0414\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438 \u044d\u0442\u043e \u043c\u043e\u0436\u043d\u043e \u0438\u0437\u043e\u0431\u0440\u0430\u0437\u0438\u0442\u044c:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u041d\u0430 \u044d\u0442\u043e\u043c \u043a\u043e\u0440\u043e\u0442\u043a\u043e\u043c \u043f\u0440\u0435\u0432\u044c\u044e \u043c\u044b \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043b\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0430\u043c\u044b\u0445 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u044b\u0445 \u0434\u0436\u043e\u0439\u043d\u043e\u0432, \u043d\u043e \u0437\u0434\u0435\u0441\u044c \u0432\u0430\u0436\u043d\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0432\u0430\u0436\u043d\u043e\u0435 \u0437\u0430\u043c\u0435\u0447\u0430\u043d\u0438\u0435 — \u0435\u0441\u043b\u0438 \u0443\u0441\u043b\u043e\u0432\u0438\u0435 \u0443 \u0432\u0430\u0441 \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u043e \u0441\u0438\u043d\u0442\u0430\u043a\u0441\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u0435\u0440\u043d\u043e (\u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0431\u0443\u043b\u0435\u0432\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 — true\/false), \u043d\u043e \u0441 \u0447\u0435\u043b\u043e\u0432\u0435\u0447\u0435\u0441\u043a\u043e\u0439 \u043b\u043e\u0433\u0438\u043a\u0438 \u043d\u0435\u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e — PostgreSQL \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 \u0421\u0423\u0411\u0414 \u0432\u0430\u043c \u0432 \u044d\u0442\u043e\u043c \u043d\u0435 \u043f\u043e\u043c\u043e\u0433\u0443\u0442 \u0438 \u043d\u0435 \u043d\u0430\u043f\u0438\u0448\u0443\u0442 \u0437\u0430\u043c\u0435\u0447\u0430\u043d\u0438\u0435 \u0438\u043b\u0438 \u043e\u0448\u0438\u0431\u043a\u0443.<\/p>\n\n\n\n
\u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 \u0441\u0443\u043c\u0430\u0441\u0448\u0435\u0434\u0448\u0435\u0433\u043e \u043d\u0435\u043b\u043e\u0433\u0438\u0447\u043d\u043e\u0433\u043e \u0437\u0430\u043f\u0440\u043e\u0441\u0430:<\/p>\n\n\n\n
SELECT A.City_name, B.City_name, Godzilla_attacks 
from A 
LEFT JOIN B 
  on (A.Country = \u2018USA\u2019 and B.Godzilla_attacks = 2) 
  OR B.Godzilla_attacks = 13<\/pre>\n\n\n\n
\u0423\u0441\u043b\u043e\u0432\u0438\u0435 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f — \u0413\u043e\u0434\u0437\u0438\u043b\u043b\u0430 \u0430\u0442\u0430\u043a\u043e\u0432\u0430\u043b\u0430 \u0430\u043c\u0435\u0440\u0438\u043a\u0430\u043d\u0441\u043a\u0438\u0435 \u0433\u043e\u0440\u043e\u0434\u0430 \u0434\u0432\u0430 \u0440\u0430\u0437\u0430 \u0438\u043b\u0438 \u0430\u0442\u0430\u043a\u043e\u0432\u0430\u043b\u0430 13 \u0440\u0430\u0437 — \u0430\u0431\u0441\u043e\u043b\u044e\u0442\u043d\u043e \u043d\u0435\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u0439 \u0437\u0430\u043f\u0440\u043e\u0441, \u043d\u043e \u043e\u0448\u0438\u0431\u043a\u0438 \u043d\u0435 \u0431\u0443\u0434\u0435\u0442:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u041b\u043e\u0433\u0438\u043a\u0430 \u0443\u0441\u043b\u043e\u0432\u0438\u0439 \u043b\u0435\u0436\u0438\u0442 \u043f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u043d\u0430 \u043f\u043b\u0435\u0447\u0430\u0445 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430!<\/strong><\/p>\n\n\n\n
\u041d\u0430\u0434\u0435\u044e\u0441\u044c \u0432\u0430\u043c \u0441\u0442\u0430\u043b\u043e \u0447\u0443\u0442\u044c \u043f\u043e\u043d\u044f\u0442\u043d\u0435\u0435, \u043a\u0430\u043a \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0442 SQL \u0434\u0436\u043e\u0439\u043d\u044b \u043f\u043e\u0434 \u043a\u0430\u043f\u043e\u0442\u043e\u043c.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u0421\u0442\u0430\u0442\u044c\u044f \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u043e\u0439 \u0432 \u0440\u0444 \u0441\u0442\u0430\u0442\u044c\u0435. \u041d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 2016 \u0433\u043e\u0434\u0430 \u0438\u0434\u0451\u0442 \u0432\u043e\u043b\u043d\u0430, \u0447\u0442\u043e\u0431\u044b \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0414\u0438\u0430\u0433\u0440\u0430\u043c\u043c \u0412\u0435\u043d\u043d\u0430 (\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432) \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f SQL \u0434\u0436\u043e\u0439\u043d\u043e\u0432. \u0417\u0430\u0431\u0438\u0432 \u0432 \u043f\u043e\u0438\u0441\u043a\u043e\u0432\u0438\u043a \u0434\u0436\u043e\u0439\u043d\u044b, \u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0443\u044e \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0443: \u0427\u0442\u043e \u043c\u0435\u043d\u044f \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0440\u0430\u0437\u0434\u0440\u0430\u0436\u0430\u0435\u0442, \u0442\u0430\u043a \u044d\u0442\u043e \u0442\u043e, \u0447\u0442\u043e \u0432\u0441\u044f \u044d\u0442\u0430 \u0441\u043c\u0435\u0441\u044c JOIN \u0438 \u0442\u0435\u043e\u0440\u0438\u0438 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432 \u0434\u0430\u0436\u0435 \u043d\u0435 \u0438\u043c\u0435\u0435\u0442 \u0441\u043c\u044b\u0441\u043b\u0430. \u041a\u0430\u043a \u0442\u043e\u043b\u044c\u043a\u043e […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[194],"tags":[244,16,66],"class_list":["post-786","post","type-post","status-publish","format-standard","hentry","category-obuchenie-postgresql","tag-diagramsvenn","tag-postgresql","tag-obuchenie"],"yoast_head":"\n\u0421\u043a\u0430\u0436\u0435\u043c \u043d\u0435\u0442 \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c\u0430\u043c \u0412\u0435\u043d\u043d\u0430 \u0434\u043b\u044f SQL \u0434\u0436\u043e\u0439\u043d\u043e\u0432 - \u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f<\/title>\n<meta name=\"description\" content=\"\u041d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 2016 \u0433\u043e\u0434\u0430 \u0438\u0434\u0451\u0442 \u0432\u043e\u043b\u043d\u0430, \u0447\u0442\u043e\u0431\u044b \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0414\u0438\u0430\u0433\u0440\u0430\u043c\u043c \u0412\u0435\u043d\u043d\u0430 (\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432) \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f SQL \u0434\u0436\u043e\u0439\u043d\u043e\u0432. \u0417\u0430\u0431\u0438\u0432 \u0432 \u043f\u043e\u0438\u0441\u043a\u043e\u0432\u0438\u043a \u0434\u0436\u043e\u0439\u043d\u044b, \u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0443\u044e \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0443:\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aristov.tech\/blog\/skazhem-net-diagrammam-venna-dlya-dzhojnov\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0421\u043a\u0430\u0436\u0435\u043c \u043d\u0435\u0442 \u0434\u0438\u0430\u0433\u0440\u0430\u043c\u043c\u0430\u043c \u0412\u0435\u043d\u043d\u0430 \u0434\u043b\u044f SQL \u0434\u0436\u043e\u0439\u043d\u043e\u0432 - \u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f\" \/>\n<meta property=\"og:description\" content=\"\u041d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 2016 \u0433\u043e\u0434\u0430 \u0438\u0434\u0451\u0442 \u0432\u043e\u043b\u043d\u0430, \u0447\u0442\u043e\u0431\u044b \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 \u0414\u0438\u0430\u0433\u0440\u0430\u043c\u043c \u0412\u0435\u043d\u043d\u0430 (\u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0445 \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432) \u0434\u043b\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u0435\u043d\u0438\u044f SQL \u0434\u0436\u043e\u0439\u043d\u043e\u0432. \u0417\u0430\u0431\u0438\u0432 \u0432 \u043f\u043e\u0438\u0441\u043a\u043e\u0432\u0438\u043a \u0434\u0436\u043e\u0439\u043d\u044b, \u043c\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0443\u044e \u043a\u0430\u0440\u0442\u0438\u043d\u043a\u0443:\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aristov.tech\/blog\/skazhem-net-diagrammam-venna-dlya-dzhojnov\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f\" \/>\n<meta property=\"article:published_time\" content=\"2024-05-07T09:26:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-07T09:28:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2024\/05\/1-v9vtdxrztr3qaxkaf71smg.webp\" \/>\n<meta name=\"author\" content=\"aeuge\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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