DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:organization:user-agent:mime-version:to:cc:subject:references:in-reply-to:content-type:content-transfer-encoding;
	b=jIdQdjeYouf9wOrUGb6nUP+68n4HQNA1mhljY/zBHxXDoMJT91UYn3zHn5wI9qiDmnRsvWrdl/CYbJMoOgXYRHy2sCnwBcpew+SpTFhADYIoehg71/Iw/pb9c6822cJs1SsMMdvN9TY2BDeAJJ8Ob5Xn15op5g6/YHY72rzhtcI=
Message-ID: <446C0BC0.7050805@gmail.com>
Date: Thu, 18 May 2006 07:53:04 +0200
From: Guillaume LELARGE <guillaume.lelarge@gmail.com>
Organization: traduc.org, postgresqlfr.org
User-Agent: Thunderbird 1.5 (X11/20060309)
MIME-Version: 1.0
To: emilu@encs.concordia.ca
CC: pgsql-sql@postgresql.org
Subject: Re: Add column and specify the column position in a table
References: <446B9418.3080700@encs.concordia.ca>
In-Reply-To: <446B9418.3080700@encs.concordia.ca>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit

Emi Lu a écrit :
> I am trying to insert one column to a specific position in a table.
> 
> In mysql, I can do:
> . create table test(id varchar(3), name varchar(12));
> . alter table test add column givename varchar(12) after id;
> 
> 
> I am looking for similar things in postgresql to add a new column to the
> correct position in a table.
> 
> Could someone hint me please.
> 

There's no similar thing in PostgreSQL. You have to duplicate the table
to do it. You can do it in a transaction :

CREATE TABLE test (id varchar(3), name varchar(12));

then later :

BEGIN;
ALTER TABLE test RENAME TO oldtest;
CREATE TABLE test (id varchar(3), givename varchar(12), name varchar(12));
INSERT INTO test (id, name) SELECT id, name FROM oldtest;
DROP TABLE oldtest;
COMMIT;

Not really interesting if you have really big tables but, in fact, you
shouldn't rely on columns' order.

Regards.


-- 
Guillaume.