Re: Optimizing NOT IN plans / verify rewrite

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Dave Crooke" <dcrooke(at)gmail(dot)com>, "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: <pgsql-performance(at)postgresql(dot)org>, "Maciek Sakrejda" <msakrejda(at)truviso(dot)com>
Subject: Re: Optimizing NOT IN plans / verify rewrite
Date: 2010-08-02 21:23:55
Message-ID: 4C56F11B020000250003412A@gw.wicourts.gov
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"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:

> DELETE FROM foo
> where foo.b in (
> select b from foo WHERE type = 'o'
> except SELECT b FROM bar
> except SELECT b FROM foo where type <> 'o');

Oops. Maybe before I get excited I should try it with a query which
is actually logically equivalent. :-(

-Kevin

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