-- 查找重复记录
select names,num
from test
where rowid != (select max(rowid)
                 from test b
                where b.names = test.names and
                      b.num = test.num)

或者使用

select names,num
from test
where rownum!= (select max(rownum)
                 from test b
                where b.names = test.names and
                      b.num = test.num)