oracle刪除重複資料,只留一條資料
阿新 • • 發佈:2019-01-05
--worked well。可以刪除重複記錄,對於多個欄位也是一樣的原理
delete from T_USER
where id in (select id from T_USER group by id having count(id) > 1)
and rowid not in
2、刪除表中多餘的重複記錄,重複記錄是根據單個欄位(Id)來判斷,只留有rowid最小的記錄
DELETE from 表 WHERE (id) IN ( SELECT id FROM 表 GROUP BY id HAVING COUNT(id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP BY id HAVING COUNT(*) > 1);
3、查詢表中多餘的重複記錄(多個欄位)
select * from 表 a where (a.Id,a.seq) in(select Id,seq from 表 group by Id,seq having count(*) > 1)
4、刪除表中多餘的重複記錄(多個欄位),只留有rowid最小的記錄
delete from 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)
5、查詢表中多餘的重複記錄(多個欄位),不包含rowid最小的記錄
select * from 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)
delete from T_USER
where id in (select id from T_USER group by id having count(id) > 1)
and rowid not in
(select min(rowid) from T_USER group by id having count(id) > 1)
引用別人的經典:
查詢及刪除重複記錄的SQL語句 1、查詢表中多餘的重複記錄,重複記錄是根據單個欄位(Id)來判斷 select * from 表 where Id in (select Id from 表 group byId having count(Id) > 1)