Database Management Systems Mcqs

Page No. 17

OLAP stands for


aOnline analytical processing


bOnline analysis processing


cOnline transaction processing


dOnline aggregate processing



The assignment operator is denoted by


a->


b<-


c=


d==


View Answer <-

Which of the following is not outer join?


aLeft outer join


bRight outer join


cFull outer join


dAll of the mentioned


View Answer All of the mentioned

In precedence of set operators, the expression is evaluated from


aLeft to left


bLeft to right


cRight to left


dFrom user specification


View Answer Left to right

Which is a unary operation:


aSelection operation


bPrimitive operation


cProjection operation


dGeneralized selection


View Answer Generalized selection

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


aUnion


bSet-difference


cDifference


dIntersection


View Answer Set-difference

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


aPredicates, relation


bRelation, Predicates


cOperation, Predicates


dRelation, Operation


View Answer Predicates, relation

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


aPi (Greek)


bSigma (Greek)


cLambda (Greek)


dOmega (Greek)


View Answer Sigma (Greek)

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


aSet intersection


bNatural join


cAssignment


dNone of the mentioned


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


bStructural


cProcedural


dFundamental


View Answer Procedural

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