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 ...
DBMS Functional Dependency MCQs: This section contains multiple-choice questions and answers on functional dependency in DBMS. Submitted byAnushree Goswami, on March 31, 2022 1. Two attributes can be functionally ___ on/of each other. Dependent ...
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...
3.1.1DefinitionofFD-pp68Section3.1.1 LetRbearelationschemeandX,YbesetsofattributesinR. AfunctionaldependencyfromXtoYexistsifandonlyif: Foreveryinstanceof|R|ofR,iftwotuplesin|R|agreeonthevaluesoftheattributesinX,thentheyagreeonthevaluesoftheattributesinY ...
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. ...