>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
>
>I got this problem from a friend and was wondering if anyone could help
>out.
>
>The following is a set of functional dependency for a relation R
>(A,B,C,D,E,F) with A->D, BE->CDF, C->E, D->B
>where A->D implies A determines D or D is functionally dependent on A.
>
>Questions:
>1. Show with explanation that the functional dependency AC->F
>is implied by
>the set.
>2. Compute the closure(A,C) for the above set.
>3. Is the set A,C a super key for the given relation R.
Be honest this is your homework! My mates have never asked me anything like
that (partly because I would not know the answer). I can see it now, we are
all sitting around the bar setting each other questions on relational
theory. ;-)
Harry
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