看看 小弟我要的效果如何写 sql

看看 我要的效果怎么写 sql ？
数据字段

id     name
1         a        
2         a
3         b
4         c
5         c
6         d

我想把表里的   name   重复的项查出来   怎么写啊？？

[解决办法]
create table test( cid int,seqid varchar2(100) );
/
insert into test
select 1, 'a ' from dual union all
select 2, 'a ' from dual union all
select 3, 'b ' from dual union all
select 4, 'c ' from dual union all
select 5, 'c ' from dual union all
select 6, 'd ' from dual;
--执行查询
select * from test where seqid in
(select seqid from test group by seqid having count(*)> 1)
--执行结果
1a
2a
4c
5c