Re: Optimization via explicit JOINs

From: Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com>
To: David Olbersen <dave(at)slickness(dot)org>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Optimization via explicit JOINs
Date: 2001-03-09 23:10:14
Message-ID: Pine.BSF.4.21.0103091508360.82223-100000@megazone23.bigpanda.com
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> On Fri, 9 Mar 2001, Stephan Szabo wrote:
>
> ->Not entirely. Those are only estimates, so they don't entirely line up
> ->with reality. Also, I notice the first estimates 14 rows and the second
> ->1, which is probably why the estimate is higher. In practice it probably
> ->won't be significantly different.
>
> So really I'm just getting back estimations of cost and rows returned?
> Incidentally, both queries returned the same data set, that's a Good Thing (tm).

Yeah, explain is mostly ofr showing what it's going to do and a little bit
of why it thinks it's a good idea. Hmm, what were the two queries anyway?

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