的MySQL刪除表中關於參照完整性規則

Question

我想刪除tableA而tableB除去具有匹配tableA.A_ID = tableB.A_ID

目前，我有一個外鍵設置爲CASCADE上刪除和更新TableB爲tableB.A_ID設置的所有行。

Answer 1

將制約暫時關閉的

SET SQL_SAFE_UPDATES = 0; 

DELETE FROM tableB b WHERE EXISTS (SELECT * FROM tableA a WHERE a.A_ID = b.A_ID) 

DELETE FROM tableA; 

SET SQL_SAFE_UPDATES = 1;