Re: Artificial Primary keys

From: Jan Emil Larsen <jel_at_g-it.dk>
Date: Mon, 28 Jan 2002 22:53:52 +0100
Message-ID: <3c55c844$0$14049$edfadb0f@dspool01.news.tele.dk>

"--CELKO--" <71062.1056_at_compuserve.com> skrev i en meddelelse news:c0d87ec0.0201281124.3d42e78f_at_posting.google.com...
> >> 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.

And how do you represent the DNA or the fingerprint? But I yield - they ARE natural keys with information; hopefully they don't mutate <g>.
And who know?
In any case: are they practical - how many bits do you use the record the DNA-sequence - and how do you avoid recording errors? Received on Mon Jan 28 2002 - 15:53:52 CST