2 votes 2 votes A functional dependency of the form $x\to y$ is trivial if $y\subseteq x$ $y\subset x$ $x\subseteq y$ $x\subset y\:\text{and}\:y\subset x$ Databases nielit2016mar-scientistc databases data-dependency + – admin asked Apr 2, 2020 retagged Oct 22, 2020 by Krithiga2101 admin 4.9k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes 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 smsubham answered Apr 2, 2020 smsubham comment Share Follow See 1 comment See all 1 1 comment reply Nomad commented Sep 28, 2020 reply Follow Share A is the correct answer 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes 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 abhishek tiwary answered Nov 3, 2020 abhishek tiwary comment Share Follow See all 0 reply Please log in or register to add a comment.