​​MOVE

​丢弃不满足条件的数据​

12c+版本支持,​​https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/ALTER-TABLE.html#GUID-552E7373-BF93-477D-9DA3-B2C9386F2877​​

alter table films move including rows where film_id > 4;
将符合条件的数据留下，其他数据丢弃。

按主键

delete from films
where film_id not in
( select max(film_id) over ( partition by TITLE )
  from films
);

ROWID

delete from films
where rowid in
( select rowid
  from
  ( select rowid,
           row_number() over ( partition by TITLE order by FILM_ID desc) as r
    from films
  ) 
  where r > 1
);

delete from films
 where rowid not in
       (select max(rowid) from films t group by TITLE, UK_RELEASE_DATE);

delete from films
 where rowid not in
       (select min(rowid) from films t group by TITLE, UK_RELEASE_DATE);

PARTITION

ALTER TABLE table_name DROP PARTITION partition_name;