From: Tom Lane <tgl@sss.pgh.pa.us>
To: Keith Gray <keith@heart.com.au>
Cc: Masaru Sugawara <rk73@sea.plala.or.jp>
Cc: Alvar Freude <alvar@a-blast.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: 2 Selects 1 is faster, why?
Date: Thu, 27 Jun 2002 23:52:40 -0400
Message-ID: <2367.1025236360@sss.pgh.pa.us> (raw)
In-Reply-To: <3D1BA27E.9000802@heart.com.au>
References: <afag3c$kce$1@news.hub.org>
<1371510000.1025105687@gnarzelwicht.delirium-arts.de>
<20020627234531.7ECB.RK73@sea.plala.or.jp>
<3D1BA27E.9000802@heart.com.au>
Keith Gray <keith@heart.com.au> writes:
> ...but is it true that if you place the filter clause first,
> the join will not have to complete the whole table?
PG's planner does not pay attention to the ordering of WHERE clauses;
it will do what it thinks best with them in any case.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, keith@heart.com.au, rk73@sea.plala.or.jp, alvar@a-blast.org
Subject: Re: 2 Selects 1 is faster, why?
In-Reply-To: <2367.1025236360@sss.pgh.pa.us>
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