Re: Artificial Primary keys

From: Henry Feinman <>
Date: Tue, 29 Jan 2002 17:53:14 -0500
Message-ID: <>

DNA - What about identical twins?

Fingerprints - there is no way of authoritatively converting these into a data type that can support query and enforce uniqueness  (at least there wasn't 4 years ago when the vendor on the site visit said 'pay no attention to the man behind the curtain!')

Regards, Henry

--CELKO-- wrote:
Or could you give an example - that is: of a natural key that holds
information, but is immutable? <<


But we settled for fingerprints when I worked for the prison system
decades ago.

Received on Tue Jan 29 2002 - 23:53:14 CET

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