Re: One to One relationships
From: Nelson Ricardo <nelson_at_nelsonricardo.com>
Date: 7 May 2003 14:17:42 -0700
Message-ID: <1c37187b.0305071317.529e1001_at_posting.google.com>
Date: 7 May 2003 14:17:42 -0700
Message-ID: <1c37187b.0305071317.529e1001_at_posting.google.com>
71062.1056_at_compuserve.com (--CELKO--) wrote in message news:<c0d87ec0.0305071030.31b2898a_at_posting.google.com>...
> I call the SSN an external, verifable key and hence "nautral "ay
> surrogatge key, I mean a key in the system, created by the system and
> never exposed to the users (it can be binary for all we care). Hash
> codes, row ids, etc. An artificial key is one we make up internally
> and do expose to the users (needs check digits, syntax rules,
> constraints, etc.).
What about databases that include individuals outside the US? Obvoiusly, they would not have a Social Security Number. Received on Wed May 07 2003 - 23:17:42 CEST