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From: "Josh Berkus" <josh@agliodbs.com>
Subject: Re: help w/ constructing a SELECT
To: Charles Hauser <chauser@duke.edu>
Cc: pgsql-sql@postgresql.org
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Charles,

> > 3. All contigs where all clones have read = 'x'

SELECT * FROM contigs 
WHERE NOT EXISTS ( SELECT contig_id
	FROM clones WHERE clones.contig_id = contigs.contig_id
	AND read <> 'x');

i.e. "Select all contigs not having any clone whose read is something
other than 'x' "

got it?

-Josh Berkus