Oracle删除重复记录的几种常用方法

方法1： 

   DELETE FROM   tms_temp_trailer_item tmp

            WHERE   ROWID =

                       (SELECT   ROWID

                          FROM   (SELECT   ROWID,

                                           ROW_NUMBER ()

                                              OVER (

                                                 PARTITION BY stop_id, po_id

                                                 ORDER BY stop_id, po_id

                                              )

                                              rn

                                    FROM   tms_temp_trailer_item) tmp2

                         WHERE   tmp.ROWID = tmp2.ROWID AND tmp2.rn > 1);

 

方法2：

 DELETE FROM   tms_temp_trailer_item tmp

            WHERE   NOT EXISTS

                       (SELECT   NULL

                          FROM   ( SELECT   stop_id,

                                             po_id,

                                             MIN (ROWID) min_row_id

                                      FROM   tms_temp_trailer_item

                                     WHERE   row_type = 'FASTRACK'

                                 GROUP BY   stop_id, po_id) tmp2

                         WHERE   tmp.ROWID = tmp2.min_row_id)

                    AND tmp.row_type = 'FASTRACK';