SQL查詢重復記錄

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,seqhaving count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq havingcount(*)>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,seqhaving count(*) > 1)
and rowid not in (select min(rowid) from vitae group by peopleId,seq havingcount(*)>1)