Question

If A $\to$ B has trivial functional dependency, then _______.
 

• A. B is a subset of A
• B. A is a subset of B
• C. A is a subset of A'
• D. B is a subset of B'

Hint:

Trivial functional dependency means that the right-hand side of the dependency is always a subset of the left-hand side.

Answer 1

The Correct Option is A

In the case of a trivial functional dependency A $\to$ B, it means that the set B is trivially dependent on A, which implies that B is a subset of A. This follows from the property of functional dependencies where each attribute on the right-hand side must be contained within the set of attributes on the left-hand side in the case of a trivial dependency.