From: | "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: How to have a unique primary key on two tables |
Date: | 2007-11-22 11:19:56 |
Message-ID: | 20071122111956.GD2702@a-kretschmer.de |
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Lists: | pgsql-sql |
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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