mysql--重复

http://database.51cto.com/art/201011/235159.htm

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

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)

3