我们在使用数据库的时候，有时数据会有所重复，当我们只需要一项数据时，不需要显示重复的记录时，就可以用以下SQL代码：

--查找表中多余的重复记录，重复记录是根据单个字段来判断select * from people where peopleId in(select peopleId from people group by peopleIdhaving count(peopleId)>1);--删除表中多余的重复记录，重复记录是根据单个字段来判断，只保留rowid最小的记录delete from people where peoplename in(select peoplename from people group by peoplename  having count(peoplename)>1)and peopleId not in (select min(peopleId) from people group by peoplename  having count(peoplename)>1);--查找表中多余的重复记录（多个字段）select * from vitae awhere (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*)>1);--删除表中多余的重复记录（多个字段），只保留rowid最小的记录delete from vitae awhere (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);