Relational Database Management System Mcqs

Page No. 20

X→ Y is trivial if?


aX ⊂ Y

✓


bY ⊂ X

✖


cX ⊇ Y

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dNone of the mentioned

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View Answer X ⊂ Y

X → Y holds on a schema k(K) if?


aAt least one legal instance satisfies the functional dependency

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bNo legal instance satisfies the functional dependency

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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

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bForeign key

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c Super key

✓


dDomain

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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

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bIdeal relation

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c Perfect relation

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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

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cCanonical dependency

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dCanonical clause

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View Answer Canonical cover

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


aDependency losing

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bDependency preserving

✓


cLossless

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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

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bFunctionally implied

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c Logically determined

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dFunctionally determined

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


aA→BC

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b A→B

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cA→C

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d All of the mentioned

✓



State true or false: Functional dependencies are transitiv


a True

✓


bFalse

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ceither true of false

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dnone of these

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View Answer True

Armstrong axioms are called sound because?


aThey are expensive

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bThey cannot generate correct functional dependencies

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cThey allow us to generate the complete closure

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dThey cannot generate incorrect functional dependencies

✓



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