MySQL之You can't specify target table for update in FROM clause解决办法 Published on Nov 25, 2020 in Java with 1 comment MySQL中You can't specify target table for update in FROM clause错误的意思是说，不能先select出同一表中的某些值，再update这个表(在同一语句中)。 例如下面这个sql： ```sql delete from tbl where id in ( select max(id) from tbl a where EXISTS ( select 1 from tbl b where a.tac=b.tac group by tac HAVING count(1)>1 ) group by tac ) ``` 也就是说将select出的结果再通过中间表select一遍，这样就规避了错误。注意，这个问题只出现于mysql，mssql和Oracle不会出现此问题。 ```sql delete from tbl where id in ( select a.id from ( select max(id) id from tbl a where EXISTS ( select 1 from tbl b where a.tac=b.tac group by tac HAVING count(1)>1 ) group by tac ) a ) ``` ```sql UPDATE t_user_asset SET f_cashAmount = ( SELECT ub.cashAmount FROM ( SELECT (ua.f_cashAmount+50000) cashAmount FROM t_user_asset ua WHERE ua.f_userId = 290 ) ub ) WHERE f_userId = 290 ``` 本文由 admin 创作，采用 知识共享署名4.0 国际许可协议进行许可。本站文章除注明转载/出处外，均为本站原创或翻译，转载前请务必署名。
11