From: Guillaume LELARGE <guillaume.lelarge@gmail.com>
To: emilu@encs.concordia.ca
Cc: pgsql-sql@postgresql.org
Subject: Re: Add column and specify the column position in a table
Date: Thu, 18 May 2006 07:53:04 +0200
Message-ID: <446C0BC0.7050805@gmail.com> (raw)
In-Reply-To: <446B9418.3080700@encs.concordia.ca>
References: <446B9418.3080700@encs.concordia.ca>
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.
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To: pgsql-sql@postgresql.org
Cc: guillaume.lelarge@gmail.com, emilu@encs.concordia.ca
Subject: Re: Add column and specify the column position in a table
In-Reply-To: <446C0BC0.7050805@gmail.com>
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