From: | Markus Schaber <schabi(at)logix-tt(dot)com> |
---|---|
To: | Achilleus Mantzios <achill(at)matrix(dot)gatewaynet(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Ugly group by problem |
Date: | 2006-03-29 14:44:10 |
Message-ID: | 442A9D3A.7010605@logix-tt.com |
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Thread: | |
Lists: | pgsql-sql |
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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