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I agree with you about using DOB instead of age. Again this is not for actual use and the instructions ask to use age not DOB.
Then the instructions are poor.
Reflect this observation back to your instructor. It may be that they're just trying to [over-]simplify some of the exercises they want you to do later on but, if they really
don't understand why it's a problem, be worried.
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Instructions ask to use SSN and not another type of ID. Yes definitely SSN is highly sensitive information and should not be stored without high levels of security.
Again, this is a poor advice to those who are just starting out with databases and data security.
Yes, the use of Natural Keys over meaningless, sequentially-allocated numbers
is a Good Thing and this is only an artificial construct but the
principle of using Personal Data in this way is just plain wrong.
Regards, Phill W.