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：

 1 DELETE
 2 FROM
 3     people
 4 WHERE
 5     peopleName IN (
 6         SELECT
 7             peopleName
 8         FROM
 9             people
10         GROUP BY
11             peopleName
12         HAVING
13             count(peopleName) > 1
14     )
15 AND peopleId NOT IN (
16     SELECT
17         min(peopleId)
18     FROM
19         people
20     GROUP BY
21         peopleName
22     HAVING
23         count(peopleName) > 1
24 )

自己使用的时候显示报错：

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

[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

1 delete from tb where id=xx

是个笨方法，暂时先解决问题吧。