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  • MySQL之You can't specify target table for update in FROM clause解决办法

    这篇文章主要介绍了mysql中You can’t specify target table for update in FROM clause错误解决方法,需要的朋友可以参考下

    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:


    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
    )

    改写成下面就行了(就是where条件再嵌套一层查询):

    代码如下:

    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
    )

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  • 原文地址:https://www.cnblogs.com/yiyanwei/p/15791656.html
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