MYSQL查询重复记录的方法很多，下面就为您介绍几种最常用的MYSQL查询重复记录的方法，希望对您学习MYSQL查询重复记录方面能有所帮助。

1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断

select*frompeople 
wherepeopleIdin(selectpeopleIdfrompeoplegroupbypeopleIdhavingcount(peopleId)>1) 

2、删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录

deletefrompeople 
wherepeopleIdin(selectpeopleIdfrompeoplegroupbypeopleIdhavingcount(peopleId)>1) 
androwidnotin(selectmin(rowid)frompeoplegroupbypeopleIdhavingcount(peopleId)>1) 

3、查找表中多余的重复记录（多个字段）

select*fromvitaea 
where(a.peopleId,a.seq)in(selectpeopleId,seqfromvitaegroupbypeopleId,seqhavingcount(*)>1) 

4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录

deletefromvitaea 
where(a.peopleId,a.seq)in(selectpeopleId,seqfromvitaegroupbypeopleId,seqhavingcount(*)>1) 
androwidnotin(selectmin(rowid)fromvitaegroupbypeopleId,seqhavingcount(*)>1) 

5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录

select*fromvitaea 
where(a.peopleId,a.seq)in(selectpeopleId,seqfromvitaegroupbypeopleId,seqhavingcount(*)>1) 
androwidnotin(selectmin(rowid)fromvitaegroupbypeopleId,seqhavingcount(*)>1)