Question: IV. Relational database theory (25 points) Given R = ( A, B, C, D, E, F ) and F = { A BC, E CF,

IV. Relational database theory (25 points)

Given R = (A, B, C, D, E, F) and F = {ABC, ECF, BE, CDEF}.

(1) Calculate the attribute set closure (AB)+of AB.

(2) Is ADF implied by F?

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