Mysql刪除重覆數據保留最小的id

在網上查找刪除重覆數據保留id最小的數據，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 )

自己使用的時候顯示報錯：

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

暫時不知道是什麼原因導致的。

然後想辦法分佈操作，首先篩選出有重覆user的數據，然後用max()選出其中較大的那一行：

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

然後再根據得到的max(id)逐條刪除多餘的數據

1 delete from tb where id=xx

是個笨方法，暫時先解決問題吧。