SQL & PL/SQL :: Duplicate Value In Table

I have a following table,

create table ashok_temp11(col1 varchar2(10),col2 varchar2(10));

and have the following values,

insert into ashok_temp11 values('A1','1001');
insert into ashok_temp11 values('A2','1001');
insert into ashok_temp11 values('A3','1002');
insert into ashok_temp11 values('A4','1003');

[Code]...

I need the duplicate values in the table. That means

col1 col2
a1 1001
a2 1001
a6 1001
a3 1002
a7 1002

I tried the following query and its not fetching me any records.

SELECT col1,
col2
FROM ashok_temp11
GROUP BY col1,
col2
HAVING COUNT(col2) > 1
ORDER BY col2