From: Louis-David Mitterrand <vindex+lists-pgsql-sql@apartia.org>
To: pgsql-sql@postgresql.org
Subject: check constraint on multiple tables?
Date: Wed, 3 Mar 2010 16:02:27 +0100
Message-ID: <20100303150227.GA18661@apartia.fr> (raw)
Hi,
I've got this chain of tables:
ship --> (id_ship) --> cabin_type --> (id_cabin_type) --> cabin_category
--> (id_cabin_category) --> cabin
The 'cabin' table has (cabin_number, id_cabin_category ref. cabin_category)
How can I guarantee unicity of cabin_number per ship?
For now I added a unique(cabin_number,id_cabin_category) but this does
not guarantee unicity for (cabin_number,ship.id_ship).
What is the best solution? Adding an id_ship to 'cabin'? Or check'ing
with a join down to 'ship'? (if possible).
Thanks,
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To: pgsql-sql@postgresql.org
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Subject: Re: check constraint on multiple tables?
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