NIELIT 2016 MAR Scientist C - Section C: 4

Question

A functional dependency of the form $x\to y$ is trivial if

• A. $y\subseteq x$
• B. $y\subset x$
• C. $x\subseteq y$
• D. $x\subset y\:\text{and}\:y\subset x$

Answer 1

A trivial functional dependency is a database dependency that occurs when describing a functional dependency of an attribute or of a collection of attributes that includes the original attribute.

So A is correct.

Ref: https://www.lifewire.com/trivial-functional-dependency-1019761

Comments

A is the correct answer

Answer 2

Axiom of reflexivity – If  is a set of attributes and  is subset of , then  holds . If  then  This property is trivial property

 

so answer A is correct option