X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org
Received: from localhost (unknown [200.46.204.144])
	by svr1.postgresql.org (Postfix) with ESMTP id F1B8DD1B238
	for <pgsql-sql-postgresql.org@localhost.postgresql.org>;
	Wed,  9 Jun 2004 04:23:01 -0300 (ADT)
Received: from svr1.postgresql.org ([200.46.204.71])
	by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024)
	with ESMTP id 35377-01
	for <pgsql-sql-postgresql.org@localhost.postgresql.org>;
	Wed,  9 Jun 2004 07:22:58 +0000 (GMT)
Received: from anchor-post-37.mail.demon.net (anchor-post-36.mail.demon.net
	[194.217.242.86])
	by svr1.postgresql.org (Postfix) with ESMTP id D0B4AD1B18A
	for <pgsql-sql@postgresql.org>; Wed,  9 Jun 2004 04:22:53 -0300 (ADT)
Received: from mwynhau.demon.co.uk ([193.237.186.96]
 helo=mainbox.archonet.com)
	by anchor-post-37.mail.demon.net with esmtp (Exim 3.35 #1)
	id 1BXxQ8-0008s7-0b; Wed, 09 Jun 2004 08:22:51 +0100
Received: from [192.168.1.17] (client17.archonet.com [192.168.1.17])
	by mainbox.archonet.com (Postfix) with ESMTP
	id 26B9216269; Wed,  9 Jun 2004 08:22:38 +0100 (BST)
Message-ID: <40C6BABD.6060204@archonet.com>
Date: Wed, 09 Jun 2004 08:22:37 +0100
From: Richard Huxton <dev@archonet.com>
User-Agent: Mozilla Thunderbird 0.6 (X11/20040502)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: mixo <mixo@coza.net.za>
Cc: pgsql-sql@postgresql.org
Subject: Re: Last insert id
References: <40C6AD19.70302@coza.net.za>
In-Reply-To: <40C6AD19.70302@coza.net.za>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-Virus-Scanned: by amavisd-new at hub.org
X-Spam-Status: No, hits=0.0 tagged_above=0.0 required=5.0 tests=
X-Spam-Level: 
X-Archive-Number: 200406/68
X-Sequence-Number: 18013

mixo wrote:
> I have three tables which are related a serial field, table1_id, in on 
> of the tables. Updating the tables is done through a transaction. My 
> problem is, once I have insert  a row in the first tables with 
> table1_id, I need for the other two tables. How can I get this? Is it 
> safe to use "select max(table1_id) from table1" after the insert?

A SERIAL column is just an ordinary integer with a default of 
nextval(<sequence-name>).

All you need to do is:
INSERT INTO t1 (...) VALUES (...)
INSERT INTO t2 (...) VALUES (currval(<sequence-name-from-table1>)...)

Sequences are guaranteed to give values relevant to your current connection.

-- 
   Richard Huxton
   Archonet Ltd