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Re: Primary Key Theory Question

From: N. Shamsundar <shamsundar_AT_uh.edu_at_nospam.xyz>
Date: Mon, 29 Mar 2004 13:40:38 -0600
Message-ID: <c49u7q$2u1c$1@masala.cc.uh.edu>

Don Verhagen wrote:
> In news:9aie60p88f5p07u0osaud08km55aq03cri_at_4ax.com,
> Bob Hairgrove <wouldnt_you_like_at_to_know.com> typed:
> : On Sun, 28 Mar 2004 18:56:03 GMT, Ben <BenNOSPAM_at_NOSPAMknieff2.com>
> : wrote:
> :
> [Snipped...]
> SSN is *not* a good *primary* key in large personnel databases, working in
> the industrial temporary services industry, I can tell you have duplicate
> SSN's (ya know, the same guys sells the fake SSN cards to multiple people).
> Just a perspective from the employment end.
>

Here is another piece of information about SSNs : I work with student records at a university, and we have many students with two SSNs. When foreign students arrive, they are given an SSN beginning with 999; later, they open a bank account or get a job and obtain a "regular" SSN. It is tricky to unify/merge records with two different SSN values.

N. Shamsundar
University of Houston Received on Mon Mar 29 2004 - 13:40:38 CST

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