Re: Primary Key

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On 11/23/07 03:33, Peter Childs wrote:
>
>
> On 21/11/2007, *Sascha Bohnenkamp* <asbohnenkamp@gmx.de
> <mailto:asbohnenkamp@gmx.de>> wrote:
>
>     > Fie on you evil synthetic key lovers.  Long live the Natural Key!
>
>     think of an foreign key referencing a primary key with 6 columns *urgs*
>     never!
>
>
>
> The worse thing I meet is people who think primary keys need to be
> integer single field unique serial fields
>
> I tend to agree that primary keys should be single fields if they need
> to be referenced but should also be natural if at all possible. ie use
> car number plates rather than some serial int.

I wouldn't trust plate number to be unique over time, since the
format "ABC 123" only has a capacity of 17,576,000 vehicles.

- --
Ron Johnson, Jr.
Jefferson LA  USA

%SYSTEM-F-FISH, my hovercraft is full of eels
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