From: Josh Berkus <josh@agliodbs.com>
To: saads@umich.edu
To: pgsql-sql@postgresql.org
Subject: Re: Creating a foreign key on the Union of two tables
Date: Mon, 7 Apr 2003 11:27:03 -0700
Message-ID: <200304071127.03166.josh@agliodbs.com> (raw)
In-Reply-To: <a811aba0.0304061353.664e2263@posting.google.com>
References: <a811aba0.0304061353.664e2263@posting.google.com>
Saad,
> I have 2 tables "A" and "B" in mySQL. They both have an attribute 'id'
> which is unique between the 2 tables. I want the union of these 2
> attributes to be a foreign key in a 3rd table "C". How do I specify
> this constraing in sql (mySQL) in table C? And for complex reasons I
> cannot merge the 2 tables A and B.
IMHO, you cannot do this in MySQL. How about upgrading to PostgreSQL? Then
we can help you.
--
-Josh Berkus
Aglio Database Solutions
San Francisco
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To: pgsql-sql@postgresql.org
Cc: josh@agliodbs.com, saads@umich.edu
Subject: Re: Creating a foreign key on the Union of two tables
In-Reply-To: <200304071127.03166.josh@agliodbs.com>
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