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UGC-NET | UGC NET CS 2014 Dec – III | Question 10

  • Last Updated : 03 Jul, 2018

Let R = ABCDE is a relational scheme with functional dependency set F = {A → B, B → C, AC → D}. The attribute closures of A and E are
(A) ABCD, φ
(B) ABCD, E
(C) Φ, φ
(D) ABC, E


Answer: (B)

Explanation: The attribute closures of A:
A+ = ABCD
The attribute closures of E:
E+ = E.
So, option (B) is correct.

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