Oracle數據庫 刪除重複數據並保留一條

刪除表中多餘的重複記錄（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 count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)