Database Management Systems Mcqs

Page No. 17

OLAP stands for


aOnline analytical processing

✓


bOnline analysis processing

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cOnline transaction processing

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dOnline aggregate processing

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The assignment operator is denoted by


a->

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b<-

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c=

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d==

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View Answer <-

Which of the following is not outer join?


aLeft outer join

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bRight outer join

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cFull outer join

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dAll of the mentioned

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View Answer All of the mentioned

In precedence of set operators, the expression is evaluated from


aLeft to left

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bLeft to right

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cRight to left

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dFrom user specification

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View Answer Left to right

Which is a unary operation:


aSelection operation

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bPrimitive operation

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cProjection operation

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dGeneralized selection

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View Answer Generalized selection

The ___________ operation, denoted by −, allows us to find tuples that are in one relation but are not in another.


aUnion

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bSet-difference

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cDifference

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dIntersection

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View Answer Set-difference

For select operation the ________ appear in the subscript and the ___________ argument appears in the paranthesis after the sigma.


aPredicates, relation

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bRelation, Predicates

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cOperation, Predicates

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dRelation, Operation

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View Answer Predicates, relation

Which of the following is used to denote the selection operation in relational algebra?


aPi (Greek)

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bSigma (Greek)

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cLambda (Greek)

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dOmega (Greek)

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View Answer Sigma (Greek)

Which of the following is a fundamental operation in relational algebra?


aSet intersection

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bNatural join

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cAssignment

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dNone of the mentioned

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View Answer None of the mentioned

Relational Algebra is a __________ query language that takes two relations as input and produces another relation as an output of the query.


aRelational

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bStructural

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cProcedural

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dFundamental

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View Answer Procedural

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