From: A. Kretschmer <andreas.kretschmer@schollglas.com>
To: pgsql-sql@postgresql.org
Subject: Re: How to have a unique primary key on two tables
Date: Thu, 22 Nov 2007 12:19:56 +0100
Message-ID: <20071122111956.GD2702@a-kretschmer.de> (raw)
In-Reply-To: <99d8c2310711220301p57c9b7c5i4620a7e658d13b7d@mail.gmail.com>
References: <99d8c2310711220301p57c9b7c5i4620a7e658d13b7d@mail.gmail.com>
am Thu, dem 22.11.2007, um 12:01:59 +0100 mailte Daniel bodom_lx Graziotin folgendes:
> Hi everybody,
> I need to have a primary key which has to be unique on two tables.
> E.g.:
>
> CREATE TABLE first
> (
> id serial NOT NULL,
> testo text,
> )
>
> CREATE TABLE second
> (
> id serial NOT NULL,
> testo text,
> )
>
> When I insert some text on "first", I would like first.id = second.id
> + 1, and vice versa.
> A sort of primary key in common for both tables.
>
> Any hints?
Yes. Create a SEQUENCE and use nextval(sequence) as primary key on both
tables.
Andreas
--
Andreas Kretschmer
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GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net
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To: pgsql-sql@postgresql.org
Cc: andreas.kretschmer@schollglas.com
Subject: Re: How to have a unique primary key on two tables
In-Reply-To: <20071122111956.GD2702@a-kretschmer.de>
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