Re: many-to-many relationship

From: Louis-David Mitterrand <vindex+lists-pgsql-sql(at)apartia(dot)org>
To: pgsql-sql(at)postgresql(dot)org
Subject: Re: many-to-many relationship
Date: 2008-10-06 15:25:32
Message-ID: 20081006152532.GA29877@apartia.fr
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On Mon, Oct 06, 2008 at 09:25:09AM -0400, Dan McFadyen wrote:
> Hello,
>
> Simplest way I can think of is create 3 relation tables, a person/image
> table, location/image table and event/image table.
>
> Each is just made up for 2 foreign keys to the first ID and image ID,
> using both as the PK for the table.

On Mon, Oct 06, 2008 at 09:30:41AM -0400, Dave Steinberg wrote:
> The typical way to do this would be to have your image table be just
> about images, and then to isolate the relationship information into
> mapping tables. Those would look like:
>
> image <=> people
> (image_id, person_id), with the primary key being the pair of columns.
> In SQL, roughly:

Thanks Dan and Dave,

you suggested the same solution which seems the most reasonable.

--
http://www.lesculturelles.net

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