Question: Consider a relation with schema R(A,B,C,D) and FD's AB -> C, C -> D, and D -> A. 1) By computing attribute closures, determine all

Consider a relation with schema R(A,B,C,D) and FD's AB -> C, C -> D, and D -> A.

1) By computing attribute closures, determine all the keys of R.

2) What are the superkeys for R that are not keys?

3) What are all the notrivial FD's that follow from the given FD's? You should restrict yourself to FD's with single attributes on the right side.

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