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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Jim C. Nasby <jnasby@pervasive.com>
Cc: pgsql-hackers@postgresql.org
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] temporary indexes
Date: Tue, 28 Feb 2006 13:06:56 -0500
Message-ID: <16797.1141150016@sss.pgh.pa.us> (raw)
In-Reply-To: <44043A34.EE98.0025.0@wicourts.gov>
References: <44041B68.EE98.0025.0@wicourts.gov>
	<20060228164515.GS82012@pervasive.com>
	<20060228164515.GS82012@pervasive.com>
	<16076.1141146348@sss.pgh.pa.us>
	<440435BC.EE98.0025.0@wicourts.gov>
	<44043A34.EE98.0025.0@wicourts.gov>

"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> EXISTS works in situations where
> you need to compare on multiple columns, so it is useful in many
> situations where IN or MIN/MAX techniques just don't work.

IN works fine on multiple columns:

	(foo, bar, baz) IN (SELECT x, y, z FROM ...)

			regards, tom lane

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