GATE|GATE-CS-2013 |Question9
Relation R has eight attributes ABCDEFGH. Field of R contain only atomic values.
F={CH->G,A->BC,B->CFH,E->A,F->EG} is a set of functional dependencies(FD) so that F+ is exactly the set of FD that hold for R
How many candidate keys does the relation R have?
(A) 3
(B) 4
(C) 5
(D) 6
Answer (B)
Candiate keys are AD,BD,ED,FD.
So answer is 4.
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