From: Kevin Grittner <Kevin.Grittner@wicourts.gov>
To: Daniele Varrazzo <piro@develer.com>
To: pgsql-performance@postgresql.org
Subject: Re: An "obvious" index not being used
Date: Thu, 19 Jun 2008 08:46:26 -0500
Message-ID: <485A1CA6.EE98.0025.0@wicourts.gov> (raw)
In-Reply-To: <4859B13F.3070103@develer.com>
References: <4859B13F.3070103@develer.com>
>>> Daniele Varrazzo <piro@develer.com> wrote:
> select count(*) from foo
> where foo.account_id in (
> select id from accounts where system = 'abc');
> Total runtime: 13412.226 ms
Out of curiosity, how does it do with the logically equivalent?:
select count(*) from foo
where exists (select * from accounts
where accounts.id = foo.account_id
and accounts.system = 'abc');
-Kevin
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To: pgsql-performance@postgresql.org
Cc: Kevin.Grittner@wicourts.gov, piro@develer.com
Subject: Re: An "obvious" index not being used
In-Reply-To: <485A1CA6.EE98.0025.0@wicourts.gov>
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