Date: Wed, 24 Feb 2010 14:09:09 +0100
From: "A. Kretschmer" <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: join with an array
Message-ID: <20100224130909.GL22249@a-kretschmer.de>
References: <20100224124023.GA16500@apartia.fr>
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In response to Louis-David Mitterrand :
> Hi,
> 
> I'm trying the following query:
> 
> 	select array_agg(t1.id) from table1 t1 join table2 t2 on (t2.id = any(array_agg)) group by t1.col1;
> 
> but I get this error: ERROR:  column "array_agg" does not exist
> 
> I tried aliasing array_agg(t1.id) without success.
> 
> Thanks for any suggestions,

I can't really understand what you want to achieve, but maybe this is
what you are looking for:

test=*# select * from a;
 id | v
----+---
  1 | 1
  2 | 1
  3 | 1
  4 | 1
  5 | 2
  6 | 2
(6 rows)

test=*# select * from b;
 id
----
  1
  3
(2 rows)

test=*# select array_agg(a.id), v from a join b on (b.id in (select a.id from a)) group by a.v;
     array_agg     | v
-------------------+---
 {1,2,3,4,1,2,3,4} | 1
 {6,5,5,6}         | 2
(2 rows)


Question: you are 'pif' in the irc-channel?


Regards, Andreas
-- 
Andreas Kretschmer
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