Re: compare two rows

On Tue, Oct 12, 2010 at 3:10 PM, Ben Kim <bkim(at)tamu(dot)edu> wrote:

> create table test_dup (id serial primary key, val text);
> insert into test_dup(val)values('some text');
> insert into test_dup(val)values('some texta');
>
> select * from test_dup;
>  id |    val
> ----+------------
>  1 | some text
>  2 | some texta

SELECT Array_agg( id ) AS duplicate_ids, val
FROM test_dup
GROUP BY val
HAVING COUNT(*) > 1;

SELECT T1.id, T2.id, T.val
FROM test_dup AS T1
INNER JOIN test_dup AS T2
USING ( val );

--
Regards,
Richard Broersma Jr.

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