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From: Josh Berkus <josh@agliodbs.com>
Reply-To: josh@agliodbs.com
Organization: Aglio Database Solutions
To: Bruno Wolff III <bruno@wolff.to>
Subject: Re: Indexing UNIONs
Date: Wed, 17 Jul 2002 17:19:22 -0700
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Bruno,

> I think you might be able to do this using (one sided) outer joins of the=
=20
event
> table to the Case and Trial Group tables. The join rules will need to wor=
k=20
for
> exactly one of the two tables. You probably will want to use case stateme=
nts=20
in
> the select list to pick values from the right table.

Yeah, I'm doing that in some places.  It just doesn't work for all queries.
COALESCE() is my friend.

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