mysql 数据库中存在重复记录,删除保留其中一条

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
)

思路：

　　1、先查询出重复的name字段

　　2、查询出含有 第(1)步中name字段 的数据，选取id最小一个进行保留，其余的全删除