1、查找表中多余的重復記錄，重復記錄是根據單個字段（peopleId）來判斷

select * from people   

where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 

2、刪除表中多余的重復記錄，重復記錄是根據單個字段（peopleId）來判斷，只留有rowid最小的記錄  

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、查找表中多余的重復記錄（多個字段）

select * from vitae a   

where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)   

4、刪除表中多余的重復記錄（多個字段），只留有rowid最小的記錄

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、查找表中多余的重復記錄（多個字段），不包含rowid最小的記錄

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)