Relational Database Management System Mcqs

Page No. 6

SQL subqueries that can occur wherever a value is permitted provided the subquery gives only one tuple with a single attribute are called _________


aExact Subqueries


bVector Subqueries


cPositive Subqueries


dScalar Subqueries


View Answer Scalar Subqueries

State true or false: We can use Subqueries inside the from clause


aTrue


bFalse


ceither true and false


dnone of these


View Answer True

The _________ construct returns true if the argument in the sub-query is void of duplicates


anot null


bnot unique


c unique


dnull


View Answer unique

What is a correlated sub-query?


aAn independent query that uses the correlation name of another independent query.


bA sub-query that uses the correlation name of an outer query


c A sub-query that substitutes the names of the outer query


d A sub-query that does not depend on its outer query’s correlation names



The ______ construct returns true if a given tuple is present in the subquery.


anot exists


bpresent


cnot present


d exists


View Answer exists

The ________ comparison checker is used to check “each and every” condition


aall


band


cevery


d each


View Answer all

State true or false : Nested Subqueries cannot be used for comparing two different sets


aTrue


b False


ceither true and false


dnone of these


View Answer False

If a set is a collection of values given by the select clause, The ______ connective tests for set membership


awithin


b include


c under


din


View Answer in

What is a subquery?


aA subquery is a select-from-where expression that is nested within another queryA subquery is a select-from-where expression that is nested within another query


b A subquery is any query that is nested within another query


cA subquery is a relation that is externally specified which can be used to handle data in queries


d A subquery is a condition that excludes all the invalid tuples from the database



Which of the following cannot be used to modify the data in a database


aupdate


binsert


cdelete


d drop


View Answer drop

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