What are Armstrong's Axioms in Functional Dependency in DBMS?Armstrong axioms are a complete set of inference rules or axioms, introduced and developed by William W. Armstrong in 1974. The inference rules are sound which is used to test logical inferences of functional dependencies. The axiom ...
Trivial Functional Dependency Non-trivial Functional Dependency Both A and B None of the above Answer:C) Both A and B Explanation: There are mainly four types of Functional Dependency in DBMS: Trivial functional dependency Non-Trivial functional dependency ...
The dependency of an attribute on a set of attributes is known as trivial functional dependency if the set of attributes includes that attribute. Symbolically: A ->B is trivial functional dependency if B is a subset of A. The following dependencies are also trivial: A->A & B->B For exam...
DBMSmultivalued dependenciesjoin dependenciesworst case running timelossless join dependenciesacyclic join dependencieshierarchical decompositionsfunctional dependenciespolynomial/ C6160D Relational databasesWe describe an algorithm to test whether a multivalued dependency is implied by a set of functional and join...
How to find whether a functional dependency is valid or invalid? Step 1:Check if all the values of "A" are distinct than it is valid otherwise invalid. Step 2:Check if all the values of the "B" are same than the functional dependency is also valid. ...