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From: Josh Berkus <josh@agliodbs.com>
Reply-To: josh@agliodbs.com
Organization: Aglio Database Solutions
To: Charles Hauser <chauser@duke.edu>,
	PSQL_list <pgsql-sql@postgresql.org>
Subject: Re: help w/ constructing a SELECT
Date: Thu, 19 Sep 2002 16:40:50 -0700
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Charles,

> Having a problem with a query.
> I would like to construct a query which will return a list of all
> contigs which are comprised of clones whose 'read' =3D 'x' (read can be
> either 'x' or 'y').

It appears that you haven't formulated clearly what you want to get.  I can=
=20
see 3 possibilities:

1. All contigs with one or more clones whose read =3D 'x' and those clones.
2. All contigs with one or more clones whose read =3D 'x' and all of those=
=20
contig's clones
3. All contigs where all clones have read =3D 'x'

Which do you want?=20=20

--=20
-Josh Berkus
 Aglio Database Solutions
 San Francisco