From: hubert depesz lubaczewski <depesz@depesz.com>
To: Stanislas de Larocque <dllstan@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Optimize querry sql
Date: Fri, 14 Sep 2007 15:36:41 +0200
Message-ID: <20070914133641.GA31759@depesz.com> (raw)
In-Reply-To: <bc40d0a30709140602x2a7914bcs8fa65d738abc4e92@mail.gmail.com>
References: <bc40d0a30709140602x2a7914bcs8fa65d738abc4e92@mail.gmail.com>
On Fri, Sep 14, 2007 at 03:02:59PM +0200, Stanislas de Larocque wrote:
> I want to optimize my query sql (execution time : 2665 ms) :
SELECT
b.idxreseller,
sum(a.nbrq),
b.namereseller
from
stat a,
reseller b
where
b.asp=6
and a.idxreseller=b.reseller
and a.month=date_part('month',now() - interval '1 month')
and a.year=date_part('year',now() - interval '1 month')
GROUP BY
b.idxreseller,b.namereseller limit 15;
1. cast all date_parts to int4, like in:
a.month = cast( date_part('month',now() - interval '1 month') as int4)
2. why there is a limit without any order by?
3. change it to get namereseller from subselect, not from join.
depesz
--
quicksil1er: "postgres is excellent, but like any DB it requires a
highly paid DBA. here's my CV!" :)
http://www.depesz.com/ - blog dla ciebie (i moje CV)
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To: pgsql-sql@postgresql.org
Cc: depesz@depesz.com, dllstan@gmail.com
Subject: Re: Optimize querry sql
In-Reply-To: <20070914133641.GA31759@depesz.com>
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