From: Volkan YAZICI <yazicivo@ttnet.net.tr>
To: Böszörményi Zoltán <zboszor@dunaweb.hu>
Cc: pgsql-performance@postgresql.org
Subject: Re: Precomputed constants?
Date: Wed, 14 Jun 2006 14:07:13 +0300
Message-ID: <20060614110713.GA2277@alamut.tdm.local> (raw)
In-Reply-To: <3167.213.163.11.81.1150282434.squirrel@www.dunaweb.hu>
References: <3167.213.163.11.81.1150282434.squirrel@www.dunaweb.hu>
On Jun 14 12:53, Böszörményi Zoltán wrote:
> # explain analyze select * from mxstrpartsbg where szam =
> round(800000*random())::integer;
AFAIK, you can use sth like that:
SELECT * FROM mxstrpartsbg
WHERE szam = (SELECT round(800000*random())::integer OFFSET 0);
This will prevent calculation of round() for every row.
Regards.
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To: pgsql-performance@postgresql.org
Cc: yazicivo@ttnet.net.tr, zboszor@dunaweb.hu
Subject: Re: Precomputed constants?
In-Reply-To: <20060614110713.GA2277@alamut.tdm.local>
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