GATE | GATE IT 2006 | Question 60

Consider a relation R with five attributes V, W, X, Y, and Z. The following functional dependencies hold:
VY→ W, WX → Z, and ZY → V.
Which of the following is a candidate key for R?
(A) VXZ
(B) VXY
(C) VWXY
(D) VWXYZ

Answer: (B)
Explanation: Using VY, W can be explored. With WX, Z can be explored
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