Ed Leafe wrote:
>       I've worked for many clients who made claims like "we will never need 
> more than one phone number per customer" or "part numbers will never be more 
> than 4 places" 

That's why I'd never use the part number as a PK and use an auto 
incremental instead. When my customer wants to use more than 4 places 
and allow alphabetic characters in the part number (note I said "when" 
and not "if" ;.) ) it will be easy enough to make the necessary changes.

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