删除数据库中重复记录的SQL语句
在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢?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 (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
delete from people
where peopleIdin (selectpeopleIdfrom peoplegroupbypeopleId havingcount(peopleId) > 1)
and rowid not in (select min(rowid) frompeoplegroup by peopleIdhaving 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,seqhaving 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)
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