Mysql刪除重復數據保留最小的id

在網上查找刪除重復數據保留id最小的數據，方法如下：

DELETE
FROM
    people
WHERE
    peopleName IN (
        SELECT
            peopleName
        FROM
            people
        GROUP BY
            peopleName
        HAVING
            count(peopleName) > 1
    )
AND peopleId NOT IN (
    SELECT
        min(peopleId)
    FROM
        people
    GROUP BY
        peopleName
    HAVING
        count(peopleName) > 1
)

自己使用的時候顯示報錯：

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

暫時不知道是什么原因導致的。

然后想辦法分布操作，首先篩選出有重復user的數據，然后用max()選出其中較大的那一行：

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

然后再根據得到的max(id)逐條刪除多余的數據

delete from tb where id=xx

是個笨方法，暫時先解決問題吧。