Relational Database Management System Mcqs

Page No. 40

Which of the following set operations is not commutative?


aUnion

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b Intersection

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cSet difference

✓


dNone of the mentioned

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View Answer Set difference

Which of the following operations are associative


aNatural joins

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bTheta joins

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cBoth the mentioned

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dNone of the mentioned

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View Answer Both the mentioned

State true or false: Selection operations are commutative


aTrue

✓


bFalse

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ceither of true false

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dnone of these

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View Answer True

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


aEqual

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bEquivalent

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c Similar

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d Identical

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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

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bOuter join

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cAggregation

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d Inner join

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View Answer Aggregation

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


aProjection

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bAggregation

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cSet operation

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dAll of the mentioned

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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

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bFalse

✓


ceither true of false

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dnone of these

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View Answer False

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


a Conjunctive selection

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bDisjunctive selection

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cNegation

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d None of the mentioned

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


aConjunctive selection

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bDisjunctive selection

✓


cNegation

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d None of the mentioned

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View Answer Disjunctive selection

The ________ SQL command generates statistics on a particular relation


a Statistic

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bAnalyze

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c Modify

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dRunstats

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View Answer Analyze

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