Oracle查詢及刪除重復數據
阿新 • • 發佈:2017-09-25
oracle sel ont where 重復 span code 包含 cnblogs 1、查找表中多余的重復記錄,重復記錄是根據單個字段(Id)來判斷
select * from 表 where Id in (select Id from 表 group byId having count(Id) > 1)2、刪除表中多余的重復記錄,重復記錄是根據單個字段(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) FROM3、查找表中多余的重復記錄(多個字段)表 GROUP BY id HAVING COUNT(*) > 1);
select * from 表 a where (a.Id,a.seq) in(select Id,seq from 表 group by Id,seq having count(*) > 1)4、刪除表中多余的重復記錄(多個字段),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 count5、查找表中多余的重復記錄(多個字段),不包含rowid最小的記錄(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)
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 havingcount(*)>1)
Oracle查詢及刪除重復數據