You can't specify target table 'tablename' for update in FROM clause的解决方法

在执行下面的sql时报错

DELETE FROM temp WHERE id IN (SELECT a.id FROM t_user t JOIN temp a ON t.email = a.email);

这种写法在sqlserver或者oracle中是支持的，但是mysql目前是不支持的，在mysql中不能同时查询一个表的数据再同时进行删除，只能用以下的办法折中

CREATE TABLE tmp AS SELECT a.id FROM t_user t JOIN temp a ON t.email = a.email;
DELETE FROM temp WHERE id IN (SELECT id FROM tmp);

先将查询到的数据放到一个临时表中，然后再对临时表进行查询，然后再删除目标表中满足条件的数据。

转载于:https://blog.51cto.com/sucre/629493

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