On 02/08/2011 02:51 PM, Rolando Edwards wrote:
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 !!!
Thanks a lot! Very helpful!
array_to_string() + array() is exactly what I am looking for!
I just wonder that array_to_string() + array() will provide me good
performance, right? If the calculation will be based on millions records.
Thanks again!
--
Lu Ying
Rolando A. Edwards
MySQL DBA (SCMDBA)
155 Avenue of the Americas, Fifth Floor
New York, NY 10013
212-625-5307 (Work)
201-660-3221 (Cell)
AIM& Skype : RolandoLogicWorx
redwa...@logicworks.net
http://www.linkedin.com/in/rolandoedwards
-----Original Message-----
From: pgsql-sql-ow...@postgresql.org [mailto:pgsql-sql-ow...@postgresql.org] On
Behalf Of Emi Lu
Sent: Tuesday, February 08, 2011 2:36 PM
To: pgsql-sql@postgresql.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
--
Emi Lu, ENCS, Concordia University, Montreal H3G 1M8
em...@encs.concordia.ca +1 514 848-2424 x5884
--
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