Question 17257 – NTA UGC NET JUNE 2023 Paper-1
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Given the following relation instance.
x y z 1 4 2 1 5 3 1 6 3 3 2 2
Which of the following functional dependencies are satisfied by the instance?
Correct Answer: B
Question 35 Explanation:
A functional dependency A→B is said to hold if for two tuples t1 and t2.
If for t1[A] = t2[A] then t1[Y] = t2[Y].
If for t1[A] = t2[A] then t1[Y] = t2[Y].
XY → Z and Z → Y
YZ → X and Y → Z
YZ → X and X → Z
XZ → Y and Y → X
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