查找MySQL表中多余的重复记录

* 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 * from people
where peopleId in (select   peopleId from   people group by   peopleId having count(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
```
delete from people
where peopleId in (select   peopleId from people group by   peopleId   having count(peopleId) > 1)
and rowid not in (select min(rowid) from   people group by peopleId having count(peopleId )>1)
```
 
* 3、查找表中多余的重复记录（多个字段）
```
select * from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having count(*) > 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
```
delete from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>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 * from vitae a
where (a.peopleId,a.seq) in   (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)
```