You are given attributes ABCD and functional dependencies B ACD and C D as constraints Also consider a relational database design consisting of a single relation r over R ABCD (a) What are all the keys in ABCD (b) Give example of a superkey in ABCD that is not a key (c) Give example of a superkey in ABCD that is also a key (d) Give example of a trivial functional dependency over ABCD (e) Does the design help enforce the dependencies (f) Give example of a state of r and a functional dependency that is satisfied by r but does not hold in R

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Question: You are given attributes ABCD and functional dependencies B -> ACD and C -> D as constraints. Also consider a relational database design consisting of

You are given attributes ABCD and functional dependencies B -> ACD and C -> D as constraints. Also consider a relational database design consisting of a single relation r over R = ABCD.

(a) What are all the keys in ABCD?

(b) Give example of a superkey in ABCD that is not a key.

(d) Give example of a trivial functional dependency over ABCD.

(e) Does the design help enforce the dependencies?

(f) Give example of a state of r and a functional dependency that is satisfied by r but does not hold in R.

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