查询和删除表中重复数据sql语句(一)

1、查询表中重复数据。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）

elect * 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)