Re: Surrogate primary key plus unique constraint vs. natural primary key: data integrity?
From: Wolfgang Keller <feliphil_at_gmx.net>
Date: Thu, 14 Mar 2013 17:07:37 +0100
Message-ID: <20130314170737.9b5f611dd145418ebcb81a9c_at_gmx.net>
Date: Thu, 14 Mar 2013 17:07:37 +0100
Message-ID: <20130314170737.9b5f611dd145418ebcb81a9c_at_gmx.net>
> I remember when currency mapped 1:1 to country.
It *never* did.
Trivial counter-examples are e.g. all those tiny european nations such as Liechtenstein, Andorra, San Marino, Monaco etc.
Sincerely,
Wolfgang Received on Thu Mar 14 2013 - 17:07:37 CET