Relational Database Management System Mcqs

Page No. 20

X→ Y is trivial if?


aX ⊂ Y


bY ⊂ X


cX ⊇ Y


dNone of the mentioned


View Answer X ⊂ Y

X → Y holds on a schema k(K) if?


aAt least one legal instance satisfies the functional dependency


bNo legal instance satisfies the functional dependency


cEach and every legal instance satisfies the functional dependency


dNone of the mentioned



If K → R then K is said to be the _______ of R


aCandidate key


bForeign key


c Super key


dDomain


View Answer Super key

An instance of a relationAn instance of a relation that satisfies all real world constraints is known as? that satisfies all real world constraints is known as?


aProper relation


bIdeal relation


c Perfect relation


d Legal relation


View Answer Legal relation

A _________ Fc for F is a set of dependencies such that F logically implies all dependencies in Fc, and Fc logically implies all dependencies in F


aCanonical cover


bCanonical cover


cCanonical dependency


dCanonical clause


View Answer Canonical cover

We say that a decomposition having the property F’+ = F+ is a __________ decomposition.


aDependency losing


bDependency preserving


cLossless


dNone of the mentioned


View Answer Dependency preserving

If B is an attribute and A→B, Then B is said to be ________ by a.


aLogically implied


bFunctionally implied


c Logically determined


dFunctionally determined



If A→B, A→ C then which of the following is true?


aA→BC


b A→B


cA→C


d All of the mentioned



State true or false: Functional dependencies are transitiv


a True


bFalse


ceither true of false


dnone of these


View Answer True

Armstrong axioms are called sound because?


aThey are expensive


bThey cannot generate correct functional dependencies


cThey allow us to generate the complete closure


dThey cannot generate incorrect functional dependencies



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