mysql 数据表中查找重复记录

1、单个字段

查询所有重复数据

select * from ActivityWinUser where (UID) in(select UID from ActivityWinUser group by UID having count(*)>1);

去重

delete from table where Name in(select Name from table group by Name having count(*)>1);

2、多个字段

查询所有重复数据

select * from table a where (a.UID,a.ActivityID)  in (select UID,ActivityID from table group by UID,ActivityID having count(*) > 1) ;

3、去除重复记录

select *, count(distinct name) from table group by name
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作者：想你时的孤独
来源：CSDN
原文：https://blog.csdn.net/u013091013/article/details/51333155
版权声明：本文为博主原创文章，转载请附上博文链接！

注：select ex_id from zqc_log_exzdcs where d_created_date>'2018-12-20 17:12:00' and d_created_date<'2018-12-20 17:15:00' group by ex_id having count(*)>1;