Trivial and non trivial functional dependency examples

2020-02-19 11:13

A, B B is a trivial functional dependency because B is a subset of A, B. Since A, B B includes B, the value of B can be determined. It's a trivial functional dependency because determining B is satisfied by its relationship to A, B. Since the values of B are determined by the values of A, any other sequence that shares the values of A will have the exact same values as B.If a functional dependency XY holds true where Y is not a subset of X then this dependency is called non trivial Functional dependency. For example: An employee table with three attributes: empid, empname, empaddress. The following functional dependencies are nontrivial: empid empname (empname is not a subset of empid) trivial and non trivial functional dependency examples

Non trivial functional dependency in DBMS Functional dependency which also known as a nontrivial dependency occurs when AB holds true where B is not a subset of A. In a relationship, if attribute B is not a subset of attribute A, then it is considered as a nontrivial dependency.

May 13, 2015  Non trivial& Trivial Functional Dependency DBMS Databases Video lecture for gate exam preparation iit Hindi, Trivial functional dependency vs. nontrivial functional dependency Trivial If a Jan 31, 2017 16 Trivial and Non Trivial Functional Dependencies Fully Functional Dependency, Partial FD, Transitive FD and Trivial FDtrivial and non trivial functional dependency examples May 13, 2015 Non Trivial functional dependency Example DBMS Databases Video lecture for gate exam preparation From the following instance of a relation scheme R (A, B, C), we can conclude that: A B C 1 1 1 1

Trivial and non trivial functional dependency examples free

Trivial functional dependency in DBMS with example By Chaitanya Singh Filed Under: DBMS The dependency of an attribute on a set of attributes is known as trivial functional dependency if the set of attributes includes that attribute. trivial and non trivial functional dependency examples In graph theory the trivial graph is a graph which has only 1 vertex and no edges. Database theory has a concept called functional dependency, written. The dependence is true if Y is a subset of X, so this type of dependence is called trivial . All other dependences, which are Just to make it clear, If a functional dependency X Y holds, where Y is a subset of X, then it is called a trivial FD. For eg. : ABC BC. In contrast, if Y is NOT a subset of X, then it is a nontrivial functional dependency. So to find nontrivial FD you have to just count such FD s who satisfy the above condition.

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