In a relational DBMS, a one-to-one relationship is said to have functional
dependence in how many directions?
A.
one
B.
two
C.
three
D.
four
E.
unlimited
Explanation:
A one-to-one relationship is said to have functional dependence in both
directions, because there will never be multiple values associated with a single value.
A one-to-many relationship has functional dependence in one direction, resembling
an algebraic function, and a many-to-many relationship has no functional
dependence.