Mysql删除重复数据保留最小的id 的解决方法

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) > 1
  )
and peopleid not in (
  select
    min(peopleid)
  from
    people
  group by
    peoplename
  having
    count(peoplename) > 1
)

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)>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

delete from tb where id=xx

是个笨方法，暂时先解决问题吧。

总结

以上所述是小编给大家介绍的mysql删除重复数据保留最小的id 的解决方法，希望对大家有所帮助