From: | Richard Broersma <richard(dot)broersma(at)gmail(dot)com> |
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To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: check constraint on multiple tables? |
Date: | 2010-03-03 15:29:22 |
Message-ID: | 396486431003030729x17f921bcr7ff439113a5644ab@mail.gmail.com |
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Lists: | pgsql-sql |
On Wed, Mar 3, 2010 at 7:19 AM, Louis-David Mitterrand
<vindex+lists-pgsql-sql(at)apartia(dot)org> wrote:
> CREATE TABLE cabin_type (
> CREATE TABLE cabin_category (
> CREATE TABLE cabin (
I'm just curious about a few things.
1) What is the difference between a cabin_type and a cabin_category.
2) Does each ship have an exclusive set of cabin_types that no other
ship can have? The table definitions imply that this is so.
I'm just guessing here since I don't really understand the
relationships involved in a ship's cabins. However, I would expect
that a cabin should be directly related to a ship. Each cabin is
defined by a category according the set in the cabin_category table.
--
Regards,
Richard Broersma Jr.
Visit the Los Angeles PostgreSQL Users Group (LAPUG)
http://pugs.postgresql.org/lapug
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