Re: Surrogate keys

> On 1/19/06, Pollard, Mike <mpollard@cincom.com> wrote:
>> Martijn van Oosterhout wrote:
>>
>> > Please provides natural keys for any of the following:
>> >
>> > - A Person
>> > - A phone call: (from,to,date,time,duration) is not enough
>> > - A physical address
>> > - A phone line: (phone numbers arn't unique over time)
>> > - An internet account: (usernames not unique over time either)
>>
>> Ahh, a challenge.  Hmm, not sure about all of them, but here goes:
>>
>> A Person - well, you could use a bit map of their fingerprints, or maybe
>> their retinal scan.  Of course, that could change due to serious injury.
>> Maybe some kind of representation of their DNA?
>
> Unless the person in question happens to be a chimera (yes, they do exist).
>
> ;-)

Yeah, I saw that episode of CSI!  :-)
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