Subject: Re: Use select and update together
From: Guillaume Lelarge <guillaume@lelarge.info>
To: Andreas <maps.on@gmx.net>
Cc: pgsql-sql@postgresql.org
Date: Sat, 17 Sep 2011 17:51:10 +0200
In-Reply-To: <4E74B538.8080902@gmx.net>
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On Sat, 2011-09-17 at 16:56 +0200, Andreas wrote:
> Am 13.09.2011 07:50, schrieb pasman pasmański:
> > In 8.4 this syntax is not implemented.
> 
> select * from (
> update tbl set val = 1 where key in ( 1, 2, 3, 4, 5 ) returning *
> ) as x
> 
> wouldn't work even in PG 9.1.
> So what data structure is coming out of an "update ... returning *" 
> statement?
> It obviously doesn't work like a subquery.
> 

The only way to make something like this work in 9.1 would be:

WITH x AS
(update tbl set val = 1 where key in ( 1, 2, 3, 4, 5 ) returning *)
SELECT * FROM x;


-- 
Guillaume
  http://blog.guillaume.lelarge.info
  http://www.dalibo.com