Relational Database Management System Mcqs

Page No. 40

Which of the following set operations is not commutative?


aUnion


b Intersection


cSet difference


dNone of the mentioned


View Answer Set difference

Which of the following operations are associative


aNatural joins


bTheta joins


cBoth the mentioned


dNone of the mentioned


View Answer Both the mentioned

State true or false: Selection operations are commutative


aTrue


bFalse


ceither of true false


dnone of these


View Answer True

If on every legal database instant, the two expressions generate the same set of tuples, the expressions are called as


aEqual


bEquivalent


c Similar


d Identical


View Answer Equivalent

The size of a _____ is simply V(A,r) where r is the relation and A is a distinct value


a Projection


bOuter join


cAggregation


d Inner join


View Answer Aggregation

Size estimation can be done for which of the following processes?


aProjection


bAggregation


cSet operation


dAll of the mentioned


View Answer All of the mentioned

State true or false: Estimation of the size of the result of a join is not possible


a True


bFalse


ceither true of false


dnone of these


View Answer False

. The intersection of all records satisfying the individual simple conditions Oi is called as ________


a Conjunctive selection


bDisjunctive selection


cNegation


d None of the mentioned



The union of all records satisfying the individual simple conditions Oi is called as ________


aConjunctive selection


bDisjunctive selection


cNegation


d None of the mentioned


View Answer Disjunctive selection

The ________ SQL command generates statistics on a particular relation


a Statistic


bAnalyze


c Modify


dRunstats


View Answer Analyze

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