Re: Artificial Primary keys

From: Henry Feinman <Henry.Feinman_at_cogeco.ca>
Date: Tue, 29 Jan 2002 17:53:14 -0500
Message-ID: <3C5727DA.3060708@cogeco.ca>

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? <<
>
>DNA.
>
>But we settled for fingerprints when I worked for the prison system
>decades ago.
>
Received on Tue Jan 29 2002 - 16:53:14 CST