Suppose R is a relation with attributes Ax A A As a functi

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Suppose R is a relation with attributes Ax, A:, , A>: As a function of n, tell how many super keys R has, if: The only keys are (A1, A2} and {A3, A4}. Q5) Suppose R is a relation with attributes A_1, A_2, ..., A_2, As a function of n, tell how many super keys R has, if: The only keys are (A1, A2} and {A1, A3} Prove that {X^+}+ = {X}+ A relation R whose schema is the set of {A, B, C, D} attributes with FD\'s A rightarrow B and A rightarrow C. Either is a BCNF violation, be-

Solution

Q4)