From: Markus Schaber <schabi@logix-tt.com>
To: Achilleus Mantzios <achill@matrix.gatewaynet.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Ugly group by problem
Date: Wed, 29 Mar 2006 16:44:10 +0200
Message-ID: <442A9D3A.7010605@logix-tt.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0603291838520.5673-100000@matrix.gatewaynet.com>
References: <Pine.LNX.4.44.0603291838520.5673-100000@matrix.gatewaynet.com>
Hi, Achilleus,
Achilleus Mantzios wrote:
> foodb=# SELECT qoo.foo2,sum(qoo.foo3) from (SELECT mt.link_id as
> foo,_int_union(array(select mt2.feat_id from markustest mt2 where
> mt2.link_id=mt.link_id order by mt2.feat_id),'{}') as foo2,other::int4 as
> foo3 from markustest mt) as qoo GROUP BY qoo.foo2;
> foo2 | sum
> --------+-----
> {2} | 1
> {5,23} | 13
> {23} | 14
> (3 rows)
This is much like I intended to do it, but using "select distinct" in
the inner select as I don't have _int_union here, and using a temporary
table to collect the sets of link ids.
Markus
--
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf. | Software Development GIS
Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org
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To: pgsql-sql@postgresql.org
Cc: schabi@logix-tt.com, achill@matrix.gatewaynet.com
Subject: Re: Ugly group by problem
In-Reply-To: <442A9D3A.7010605@logix-tt.com>
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