Re: "select c1, method(c2) group by c1" returns all values of c2 for c1

SELECT distinct c1,array_to_string(array(SELECT c2 FROM T1 B where A.c1=B.c1),', ') from T1 A order by c1;

Give it a Try !!!

Rolando A. Edwards
MySQL DBA (SCMDBA)

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-----Original Message-----
From: pgsql-sql-owner(at)postgresql(dot)org [mailto:pgsql-sql-owner(at)postgresql(dot)org] On Behalf Of Emi Lu
Sent: Tuesday, February 08, 2011 2:36 PM
To: pgsql-sql(at)postgresql(dot)org
Subject: [SQL] "select c1, method(c2) group by c1" returns all values of c2 for c1

Good afternoon,

Is there a method to retrieve the following results:

T1(c1 int, c2 varchar(128) )
---------------------------------

(1, val1);
(1, val2);
(1, val3);
(2, val1);
(3, val5);
(3, val6);

select c1, method(c2)
group by c1

returns:
============
1, "val1, val2, val3"
2, "val1"
3, "val5, val6"

Thanks a lot!

--
Lu Ying