From: chester c young <chestercyoung@yahoo.com>
To: pgsql-sql@postgresql.org
Subject: outer join versus not exists
Date: Tue, 18 Mar 2003 08:54:27 -0800 (PST)
Message-ID: <20030318165427.52097.qmail@web12703.mail.yahoo.com> (raw)
In pg, is there any performance gain in using outer join with null as
versus using not exists, eg:
select t1.* from t1 right join t2 using( id ) where t2.id is null;
versus
select * from t1 where not exists (select 1 from t2 where t1.id=t2.id);
__________________________________________________
Do you Yahoo!?
Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your desktop!
http://platinum.yahoo.com
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: chestercyoung@yahoo.com
Subject: Re: outer join versus not exists
In-Reply-To: <20030318165427.52097.qmail@web12703.mail.yahoo.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox