數據庫查重復記錄

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

代碼如下:

select * from people
where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)
注意：這里的重復是指所有列的數據相同

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
代碼如下:

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）
代碼如下:

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
代碼如下:

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
代碼如下:

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)

6、查詢表某列的重復數據

select name from people group by name having count(name) > 1

總結

以上是生活随笔為你收集整理的数据库查重复记录的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。