SQL语言查询出表中的重复行

请教高手如何用SQL语言查询出表中的重复行？我所查的不是关键字数据，是此表中其它一个字段的数据有重复，需要查出。多谢！  
如果光选择重复行的话 
可以这样 
select distinct 有重复内容的字段名 from 表名 group by 有重复内容的字段名 having count(有重复内容的字段名)>1 
这样只是选出有重复的记录的字段 
如果要全部取出来的话 
用这样的语句 
select * from 表名 where 有重复内容的字段名 in (select distinct 有重复内容的字段名 from 表名 group by 有重复内容的字段名 having count(有重复内容的字段名)>1 ) 
即可 




例如:


create table users
(
 fseq    number(8),
 user_name varchar2(20),
 address   varchar2(40),
 fpassword varchar2(12)
)
alter table users
add(
primary key(fseq)
)


select t.*,t.rowid from users t
select distinct 有重复内容的字段名 from 表名 group by 有重复内容的字段名 having count(有重复内容的字段名)>1 


select user_name from users where user_name in
 (select distinct user_name from users group by user_name having count(user_name)>1)


select  I.* from users I where exists
 (select distinct user_name,fpassword from users 
   where User_Name = I.User_Name and fpassword = I.Fpassword group by user_name having count(*)>1  ))




创建临时表查询
with tbl as(
select  I.User_Name,i.address,i.fpassword from users I where exists
 (select distinct user_name,fpassword from users 
   where User_Name = I.User_Name and fpassword = I.Fpassword group by user_name having count(*)>1  )
   )  select distinct * from tbl b




1 lizhitao dgfd 123 AAAHZjAABAAAMYyAAA 
2 lizhitao dgfd 123 AAAHZjAABAAAMYyAAB 
3 fd        dfd323      AAAHZjAABAAAMYyAAC 
4 fdf        fd5354AAAHZjAABAAAMYyAAD 
5 dd       dsfd23AAAHZjAABAAAMYyAAE 
6 dd       sfd23AAAHZjAABAAAMYyAAF 
7 lizhitao gh 755 AAAHZjAABAAAMYyAAG