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Date: Sun, 13 Jul 2003 15:01:13 -0700
From: Joe Conway <mail@joeconway.com>
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To: Steve Wampler <swampler@noao.edu>
Cc: pgsql-sql@postgresql.org
Subject: Re: Replacing a simple nested query?
References: <20030713215042.GA18643@weaver.tuc.noao.edu>
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Steve Wampler wrote:
> I've got a simple nested query:
> 
>   select * from attributes where id in (select id from
>      attributes where (name='obsid') and (value='oid00066'));
> 
> that performs abysmally.  I've heard this described as the
> 'classic WHERE IN' problem.

I may be missing something, but why can't you just do:
   select * from attributes where name='obsid' and value='oid00066';
?

Joe