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Re: Primary key

From: Richard Broersma Jr <rabroersma(at)yahoo(dot)com>
To: Carol Walter <walterc(at)indiana(dot)edu>, pgsql-admin(at)postgresql(dot)org
Subject: Re: Primary key
Date: 2007-09-19 15:26:15
Message-ID: 558465.79884.qm@web31808.mail.mud.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-admin
--- Carol Walter <walterc(at)indiana(dot)edu> wrote:

> Does postgres allow compound or composite keys for primary keys?  I  
> thought I read someplace that it didn't.  Now, I can't find a  
> reference to it.

It does.  composite key are defined as a table constraint:
http://www.postgresql.org/docs/8.2/interactive/sql-createtable.html

This link illistrates syntax with this example:

CREATE TABLE films (
    code        char(5),
    title       varchar(40),
    did         integer,
    date_prod   date,
    kind        varchar(10),
    len         interval hour to minute,
    CONSTRAINT code_title PRIMARY KEY(code,title)
);

Regards,
Richard Broersma Jr.

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