If a functional dependency is reflexive, B is a subset of A and A is the set of attributes, then(a) B→A holds(b) A→B holds(c) AB→C holds(d) None of the mentionedThis question was posed to me in quiz.This question is from Functional-Dependency Theory in section Relational Database Design of RDBMS

If a functional dependency is reflexive, B is a subset of A and A is t

1.	If a functional dependency is reflexive, B is a subset of A and A is the set of attributes, then(a) B→A holds(b) A→B holds(c) AB→C holds(d) None of the mentionedThis question was posed to me in quiz.This question is from Functional-Dependency Theory in section Relational Database Design of RDBMS
Answer» RIGHT OPTION is (b) A→B holds Explanation: If a functional dependency is REFLEXIVE, B is a subset of A and A is the set of attributes, then A→B holds. This is called the reflexivity RULE of Armstrong’s AXIOMS.

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