Oracle 重複資料刪除資料只留一條

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查詢及重複資料刪除記錄的SQL語句 1、尋找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) 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、尋找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、尋找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)