处理Oracle中的重复记录

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)

 

（转载自：http://topic.csdn.net/u/20080508/10/4b56808e-ab77-4d6e-8e75-47f281e8e33c.html中

anglelwq的回帖）