mysql重複記錄刪除其中一條的辦法

場景：出現了兩條一模一樣的記錄，除了例如createime和id，其他都相同，現需要刪除例如重複記錄中id小的，保留一條且id較大的。

SQL：

select * from 表名 where 值A in (select 值A from 表名 where 值B = 'B值' group by 值A having count(值A) > 1) and id not in (select min(id) from 表名 where 值B = 'B值' group by 值A having count(值A) > 1) and 值B = 'B值';

查出來然後刪掉即可。

若採用如下方式會報錯，解決方式待更新：

delete from 表名 where 值A in (select 值A from 表名 where 值B = 'B值' group by 值A having count(值A) > 1) and id not in (select min(id) from 表名 where 值B = 'B值' group by 值A having count(值A) > 1) and 值B = 'B值';

報錯：

[Err] 1093 - You can't specify target table '表名' for update in FROM clause