查詢數據庫中重複記錄的方法

1、查找表中多餘的重複記錄，重複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、刪除表中多餘的重複記錄，重複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、查找表中多餘的重複記錄（多個字段） 
select * from vitae a
where (,) in   (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)

 

4、刪除表中多餘的重複記錄（多個字段），只留有rowid最小的記錄
delete from vitae a
where (,) 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、查找表中多餘的重複記錄（多個字段），不包含rowid最小的記錄
select * from vitae a
where (,) 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)