Date: Thu, 15 Jun 2006 17:03:22 -0400
From: Andrew Sullivan <ajs@crankycanuck.ca>
To: pgsql-sql@postgresql.org
Subject: Re: SQL Technique Question
Message-ID: <20060615210322.GA22035@phlogiston.dyndns.org>
References: <20060615205922.4834.qmail@web33301.mail.mud.yahoo.com>
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On Thu, Jun 15, 2006 at 01:59:22PM -0700, operationsengineer1@yahoo.com wrote:
> 
> is it a good practice to leave this included in the
> queries, as is, or should i factor it out somehow?  if
> i should factor it, how do i do so?

If what you're saying is that these additional criteria are
redundant, then it's up to you: what do you want to optimise for?  If
you're protecting against future errors, then the additional
criteria might help.  If you're protecting against having to write
your code to produce a more efficient query, you should weigh the
cost and benefit (which benefit includes "easier to debug queries"). 
There is a probably non-zero cost to the extra joins.

A

-- 
Andrew Sullivan  | ajs@crankycanuck.ca
Unfortunately reformatting the Internet is a little more painful 
than reformatting your hard drive when it gets out of whack.
		--Scott Morris