That makes the example even better: I doubt there's no one else by the name
or Litchfield.
Or Bortel, for that matter - so, you will have to add more data to make sure
you can still
identify the one person you are referring to. Add firstname, date of birth
and address.
That should make things pretty unique. But: that is not easy to maintain:
it's easier to
use a (unique) number instead. (And call that SSN, or whatever).
But the fact remeains, that in datamodelling the combination of first name,
last name,
birthdate and -address is unique. And therefor an alternate key to SSN
(which
would be referred to as technical key)
--
Frank
Niall Litchfield <n-litchfield_at_audit-commission.gov.uk> schreef in
berichtnieuws 8t11gq$s8i$1_at_soap.pipex.net...
> "frank" <fbortel_at_home.nl> wrote in message
news:39F08952.9BC60BC8_at_home.nl...
> > BTW: customer would be a better example: people never refer to, or are
> > referred to by numbers, always by name.
>
> Except in the US where *everyone* knows and often is required to state
their
> SSN.
>
> Glad I'm a European..
>
>
> --
> Niall Litchfield
> Oracle DBA
> Audit Commission UK
>
>
Received on Mon Oct 23 2000 - 05:18:59 CDT
