SQL> desc test Name Null? Type ----------------------------------------- -------- ----------------- ID NUMBER --表 test有重复的记录1,10 SQL> select * from test; ID ---------- 1 2 3 4 10 1 1 1 1 1 1011 rows selected. --查询表中的哪些记录有重复 SQL> select * from test group by id having count(*)>1; ID ---------- 1 10 --查询出没有重复记录的结果集 SQL> select * from test group by id; ID ---------- 1 2 3 4 10SQL> select distinct * from test; ID ---------- 1 2 3 4 10 --删除重复的记录 SQL> delete from test a where a.rowid!=(select max(rowid) from test b 2 where a.id=b.id);6 rows deleted.SQL> commit;Commit complete. --删除后的查询结果集 SQL> select * from test; ID ---------- 2 3