Date: Sun, 20 Nov 2005 17:17:15 +0100
From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-sql@postgresql.org
Subject: Re: Is it possible to redirect an update/insert/delete to a different
	table?
Message-ID: <20051120161715.GA2832@kaufbach.delug.de>
References: <200511201207.01114.peter_e@gmx.net>
	<ECOWS02MmWL9vVmguzY0004c4cf@smtp-out2.blueyonder.co.uk>
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Andy Ballingall <andy@areyoulocal.co.uk> schrieb:

> Hello Peter,
> 
> I'm glad it's possible, but I can't see how from the documentation.
> 
> Say if I have a table called 'apples' and a table called 'pears'.
> 
> What would the rule look like that would remap all updates on apples so that
> they were applied to pears instead?

create rule apples_pears_update as on update to apples do instead update pears set name= NEW.name where id=NEW.id ;

test=# select * from apples ;
 id | name
----+------
  1 | a
(1 row)

test=# select * from pears ;
 id | name
----+------
  1 | b
(1 row)

test=# update apples set name = 'c' where id = 1;
UPDATE 1
test=# select * from pears ;
 id | name
----+------
  1 | c
(1 row)


http://www.postgresql.org/docs/8.1/interactive/rules-update.html

HTH, Andreas
-- 
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
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