C001 Type Primary Keys

@Green: Everything you want to happen can happen; it just takes looking at the issue as an RDBMS would.
 
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If the two threads are on the same issue then let's solve it on one or the other and we'll just reference the solution thread at the tail of the other one.
 
If you are working on a school exercise those often require a certain type of solution. This thread would not have been nearly as long if you had disclosed that information. Some helpers don’t like assisting on school projects so that should be disclosed at the beginning of the thread. Then those that elect to help can take a different approach. Since you elected not to share that information with us until the end, I wish you well.
 
People won't willingly do homework or projects for you but we are all willing to help YOU do them. Knowing this is a school project can clarify things early on because at least we know the professor has something he is trying to teach you with what are occasionally strange requests and we can tell you what we think is the correct real world solution as well as help you with the complex, convoluted requirement that is simply trying to make some point.
 
These are old exercises that I'm going over for practice, they aren't going to be submitted in class. I'm covering previous work because as the saying goes "practice makes perfect." Sorry for the confusion and I don't mean to offend anyone.
 

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