Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> comp.databases.theory -> Re: Artificial Primary keys

Re: Artificial Primary keys

From: Ben Clifford <benc-news_at_hawaga.org.uk>
Date: Mon, 28 Jan 2002 12:25:35 -0800
Message-ID: <3C55B3BF.ED0EF2B1@hawaga.org.uk>


--CELKO-- wrote:

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

> DNA.
With organ transplants and the like, I wonder what potential there is for mutability here.

A sample of a person's DNA taken from (what you think is) their liver might not be the same as the DNA taken from their blood 6 years earlier, if the liver has been changed for a new one.

-- 
Ben Clifford  
http://www.hawaga.org.uk/ben/  GPG: 30F06950
webcam: http://barbarella.hawaga.org.uk/benc-cgi/watchers.cgi
Do not ever send e-mail to: philip_at_hawaga.org.uk (seriously!)
Received on Mon Jan 28 2002 - 14:25:35 CST

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US