MySql中数据去重的示例分析

小编给大家分享一下MySql中数据去重的示例分析，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

1.查出重复数据

SELECT member_email FROM group_member GROUP BY member_email HAVING COUNT(member_email) > 1

2.去除重复数据

delete from group_member where member_email in ( select TEMP.member_email from (     SELECT member_email FROM group_member GROUP BY member_email HAVING COUNT(member_email) > 1 ) as temp ) and id not in (select temp2.id from(     select min(id) as id from group_member GROUP BY member_email HAVING COUNT(member_email) > 1 )as temp2 );

以上是"MySql中数据去重的示例分析"这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注行业资讯频道！