Date: Fri, 14 Sep 2007 13:55:12 +0200
From: "A. Kretschmer" <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: Optimize querry sql
Message-ID: <20070914115512.GD7443@a-kretschmer.de>
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am  Fri, dem 14.09.2007, um 12:26:00 +0200 mailte Stanislas de Larocque folgendes:
> Hi,
> 
> Explain my sql querry :
> 
> Limit  (cost=1057.15..1057.16 rows=1 width=27)
>    ->  HashAggregate  (cost=1057.15..1057.16 rows=1 width=27)
>          ->  Nested Loop  (cost=0.00..1057.14 rows=1 width=27)
>                ->  Seq Scan on stat a  (cost=0.00..1042.98 rows=1 width=8)
>                      Filter: (((month)::double precision =
> date_part('month'::text, (now() - '1 mon'::interval))) AND
> ((year)::double precision = date_part('year'::text, (now() - '1
> mon'::interval))))
>                ->  Index Scan using resaller_pkey on revendeur b
> (cost=0.00..14.15 rows=1 width=23)
>                      Index Cond: ("outer".idxresaller = b.idxresaller)
>                      Filter: (asp = 6)
> 
> I would optimize "Seq Scan on stat a  (cost=0.00..1042.98 rows=1 width=8)"
> 
> What is your advice ?

Create indexes on the columns month and year. But, again, you have an
unpractical table-design.


> 
> Thank you
> 
> Stan
> 
> 
> 2007/9/14, A. Kretschmer <andreas.kretschmer@schollglas.com>:

Please no top-posting.
(answer on top and fullquote below)


Andreas
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Andreas Kretschmer
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