SSN's are not recycled.
>From the SSA OIG's testimony on SSN use and misuse before congress -
"The SSN is a unique identifier"
http://www.ssa.gov/oig/Testimony05222001.htm
SSN is a perfectly good PK for personnel systems. If you find duplicates
your employer certainly needs to know about it.
I once had a personnel database with 25 years of personnel data (about
1,200,000 individuals). When we loaded it into Oracle with the SSN as PK,
there was one duplicate SSN. Of course, that employer was very
conscientious about requiring a valid SSN.
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