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From: Richard Broersma Jr <rabroersma@yahoo.com>
To: Richard Broersma Jr <rabroersma@yahoo.com>
To: PostgreSQL Admin <postgres@productivitymedia.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Constraints for grouping
Date: Mon, 3 Sep 2007 13:40:06 -0700 (PDT)
Message-ID: <917951.78388.qm@web31814.mail.mud.yahoo.com> (raw)
In-Reply-To: <602367.49974.qm@web31801.mail.mud.yahoo.com>

OOPS!
--- Richard Broersma Jr <rabroersma@yahoo.com> wrote:
> CREATE UNIQUE INDEX Only_one_row_true
>           ON Your_table ( featured )
>        WHERE featured = true;
> 
> Or if you want to only allow 1 featured article per catagory then:
> 
> CREATE UNIQUE INDEX Only_one_row_true_per_catagory
>           ON Your_table ( catigories, featured )
>        WHERE featured = true;

I forgot the unique part of the DDL.

Regards,
Richard Broersma Jr.

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