occurs when you describe a functional
dependency of an attribute on a collection of
attributes that includes the original attribute.
For example, “{A, B} -> B” is a trivial functional
dependency, as is “{name, SSN} -> SSN”.
• This type of functional dependency is called
trivial because it can be derived from common
sense. It is obvious that if you already know
the value of B, then the value of B can be
uniquely determined by that knowledge.