| From: | Greg Stark <gsstark(at)mit(dot)edu> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Michael Glaesemann <grzm(at)myrealbox(dot)com>, "Dann Corbit" <DCorbit(at)connx(dot)com>, Leandro Guimarães Faria Corcete Dutra <leandro(at)dutra(dot)fastmail(dot)fm>, "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Surrogate keys (Was: enums) |
| Date: | 2006-01-19 06:46:32 |
| Message-ID: | 87bqy8ww8n.fsf@stark.xeocode.com |
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| Thread: | |
| Lists: | pgsql-general pgsql-hackers |
> >> If a primary key exists for a collection that is known never to change,
> >> for example social security number, student registration number, or
> >> employee number, then no additional system-assigned UID is required.
In point of fact Social security numbers *can* change.
--
greg
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