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Oracle查詢及刪除重復數據

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 * fromwhere Id in (select Id fromgroup 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 fromWHERE (id) IN ( SELECT id FROMGROUP BY id HAVING COUNT(id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM
GROUP BY id HAVING COUNT(*) > 1);
3、查找表中多余的重復記錄(多個字段)
select * from 表 a where (a.Id,a.seq) in(select Id,seq fromgroup 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 fromgroup by Id,seq having count
(*) > 1) and rowid not in (select min(rowid) fromgroup by Id,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
select * from 表 a where (a.Id,a.seq) in (select Id,seq fromgroup by Id,seq having count(*) > 1) and rowid not in (select min(rowid) fromgroup by Id,seq having
count(*)>1)

Oracle查詢及刪除重復數據