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Date: Wed, 21 Nov 2007 19:38:01 -0800 (PST)
From: Richard Broersma Jr <rabroersma@yahoo.com>
Subject: Re: update on join ?
To: pgsql-sql@postgresql.org, Andreas <maps.on@gmx.net>
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--- On Wed, 11/21/07, Andreas <maps.on@gmx.net> wrote:> 
> UPDATE inventory
> SET number = 0
> WHERE  thing_fk IN (SELECT thing_id FROM things WHERE color
> = 'red')

This is a perfectly acceptable ANSI-SQL update statement.

Here is non-ANSI update statement that you are probably after:

UPDATE Inventory
   SET number = 0
  FROM Things
 WHERE Inventory.thing_fk = Things.thing_id
   AND Things.color = 'red';

IIRC, Joe Celko referrers to this syntax as "T-SQL".

Regards,
Richard Broersma Jr.