RE: Enforced Constraints (sic) ??

Close.
You forgot about the violation of one of the key rules in creating unique keys. Do not embed meaning in the key.

The first 3 numbers are determined on where you apply for the SSN. That reduces the usable numbers. Someone once told me that the two numbers in the middle mean something too, but I have not been able to confirm it.

> 250,000,000 million in the U.S. (Legal)
> 999,999,999 possible numbers (xxx-xx-xxxx)
> -----------------------------------------
> equals mandatory recycling.

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Author: Page, Bruce
  INET: Bruce.Page_at_BellSouth.com

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