If A -- B and B -- A are existing functional dependencies,which of the following are NOT equivalent functional dependencies?
A)A -- B and B -- A
B)A -- B,X and B -- A,X
C)X -- A and A -- B
D)X,A -- B,X and X,B -- A,X

Question

If A --> B and B --> A are existing functional dependencies,which of the following are NOT equivalent functional dependencies?
A)A --> B and B --> A
B)A --> B,X and B --> A,X
C)X --> A and A --> B
D)X,A --> B,X and X,B --> A,X

Quizplus · Accepted Answer

X --> A and A --> B are not equivalent functional dependencies because they do not have the same left-hand side.

If a --> B and B --> a Are Existing