From: Scott Marlowe <smarlowe@g2switchworks.com>
To: Exner, Peter <Exner@his.de>
Cc: Richard Broersma Jr <rabroersma@yahoo.com>
Cc: SQL Postgresql List <pgsql-sql@postgresql.org>
Subject: Re: How to find entries missing in 2nd table?
Date: Wed, 12 Jul 2006 13:13:18 -0500
Message-ID: <1152727998.14241.24.camel@state.g2switchworks.com> (raw)
In-Reply-To: <507847EF2B23D748BAC77799DA52D0EC6FD63F@mailbox.his.de>
References: <507847EF2B23D748BAC77799DA52D0EC6FD63F@mailbox.his.de>
On Wed, 2006-07-12 at 03:06, Exner, Peter wrote:
> Hi,
>
> what about
>
> SELECT controller_id FROM control
> WHERE controller_id NOT IN
> (SELECT DISTINCT controller_id FROM datapack);
That one works too, but it's generally not as fast as the left join / is
null query on large tables. Give the two a try on a test set and you
should see the speed difference.
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To: pgsql-sql@postgresql.org
Cc: smarlowe@g2switchworks.com, Exner@his.de, rabroersma@yahoo.com
Subject: Re: How to find entries missing in 2nd table?
In-Reply-To: <1152727998.14241.24.camel@state.g2switchworks.com>
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