Using 4 digits (characters) to serve as a unique studentID is risky ...
there are only 10,000 possible values to use, and there's no guarantee that
two individuals would not "share" the same last four characters of their
SSNs.
As Jeff said, you shouldn't be using a 4 digit ID. We're used to entering the
last 4 digits of our SSN on various sites, but that's not an ID number; it's
simply being used to compare with the last 4 digits of the previously entered
ENTIRE 9 digit SSN.
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