Message-ID: <3A01984C.7FFE3B90@agliodbs.com>
Date: Thu, 02 Nov 2000 08:37:32 -0800
From: Josh Berkus <josh@agliodbs.com>
Reply-To: josh@agliodbs.com
Organization: Aglio Database Solutions
MIME-Version: 1.0
To: sqllist <pgsql-sql@postgresql.org>
Subject: Re: Outer Joins
References: <sa013083.025@eskom.co.za>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Marc,

> >This would work, but it would be *much* slower than a UNION query.  "Not
> >In" queries are perhaps the slowest you can run; see the earlier thread
> >"Query Problem" for a discussion.  UNION queries are, in fact, very fast
> >... just awkward to code and manipulate.
> 
> Why should this be slower since the UNION Query still has an identical not in clause?
> This is far easier (for me) to read.

Good point.  Frankly, if you have a relevant large population of data
(>10,000 rows) to test, I'd love to see comparative execution tests
between the two query structures.

Fortunately, this will all soon become moot; Tom says that outer joins
have been stable in the 7.1 build for a while.  Speaking of which,
when's the 7.1 "release"?  Huh, huh?

					-Josh Berkus

-- 
______AGLIO DATABASE SOLUTIONS___________________________
                                        Josh Berkus
   Complete information technology      josh@agliodbs.com
    and data management solutions       (415) 436-9166
   for law firms, small businesses       fax  436-0137
    and non-profit organizations.       pager 338-4078
                        		San Francisco