Mysql删除重复数据保留最小的id

在网上查找删除重复数据保留id最小的数据，方法如下：

 DELETE
 FROM
     people
 WHERE
     peopleName IN (
         SELECT
             peopleName
         FROM
             people
         GROUP BY
             peopleName
         HAVING
             count(peopleName) >
     )
 AND peopleId NOT IN (
     SELECT
         min(peopleId)
     FROM
         people
     GROUP BY
         peopleName
     HAVING
         count(peopleName) >
 )

自己使用的时候显示报错：

 delete from tb where id in (SELECT max(id) from tb GROUP BY user HAVING count(user)>)

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

暂时不知道是什么原因导致的。

然后想办法分布操作，首先筛选出有重复user的数据，然后用max()选出其中较大的那一行：

SELECT max(id) from tb GROUP BY user HAVING count(user)>1

然后再根据得到的max(id)逐条删除多余的数据

 delete from tb where id=xx

是个笨方法，暂时先解决问题吧。