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Which of the following is a trivial functional dependency?

8. Which of the following is a trivial functional dependency?

1. A->B, if B is a subset of A
2. A->A
3. B->B
4. All of the above

Answer: A) A->B, if B is a subset of A

Explanation:

These are the trivial functional dependencies -

1. A->B
2. A->A
3. B->B