{"id":31600,"date":"2023-01-22T20:30:40","date_gmt":"2023-01-22T15:00:40","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-sql-i-have-two-table-which-join-with-foreign-key-i-want-to-find-out-missing-id-from-second-table\/"},"modified":"2023-01-22T20:30:40","modified_gmt":"2023-01-22T15:00:40","slug":"solved-sql-i-have-two-table-which-join-with-foreign-key-i-want-to-find-out-missing-id-from-second-table","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-sql-i-have-two-table-which-join-with-foreign-key-i-want-to-find-out-missing-id-from-second-table\/","title":{"rendered":"[Solved] SQL I have two table which join with foreign key . I want to find out missing id from second table"},"content":{"rendered":"

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The normative approach is an anti-join<\/em> pattern.<\/p>\n

To find rows in table1 which have an value in the id<\/code> column which does not have a matching row in table2 (i.e. there are no rows in table2 with fk_id<\/code> value that match) <\/p>\n

 SELECT t1.id\n   FROM table1 t1\n   LEFT\n   JOIN table2 t2\n     ON t2.fk_id = t1.id\n  WHERE t2.fk_id IS NULL\n<\/code><\/pre>\n
This query basically says return all rows from table1, along with any matching rows from table2, but exclude<\/em> rows where we found a matching row in table2. Leaving us with only rows from table1 that didn’t have a match in table2.<\/p>\n
This is a demonstration of just one of the approaches. There are a couple of other query patterns that will return an equivalent result.<\/p>\n<\/p><\/div>\n
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solved SQL I have two table which join with foreign key . I want to find out missing id from second table <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] The normative approach is an anti-join pattern. To find rows in table1 which have an value in the id column which does not have a matching row in table2 (i.e. there are no rows in table2 with fk_id value that match) SELECT t1.id FROM table1 t1 LEFT JOIN table2 t2 ON t2.fk_id = t1.id … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[340],"class_list":["post-31600","post","type-post","status-publish","format-standard","hentry","category-solved","tag-mysql"],"yoast_head":"\n[Solved] SQL I have two table which join with foreign key . I want to find out missing id from second table - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-sql-i-have-two-table-which-join-with-foreign-key-i-want-to-find-out-missing-id-from-second-table\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] SQL I have two table which join with foreign key . I want to find out missing id from second table - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The normative approach is an anti-join pattern. To find rows in table1 which have an value in the id column which does not have a matching row in table2 (i.e. there are no rows in table2 with fk_id value that match) SELECT t1.id FROM table1 t1 LEFT JOIN table2 t2 ON t2.fk_id = t1.id ... 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