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

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bVector Subqueries

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cPositive Subqueries

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dScalar Subqueries

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View Answer Scalar Subqueries

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


aTrue

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bFalse

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ceither true and false

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dnone of these

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View Answer True

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


anot null

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bnot unique

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c unique

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dnull

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View Answer unique

What is a correlated sub-query?


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

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

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

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

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


anot exists

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bpresent

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cnot present

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d exists

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View Answer exists

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


aall

✓


band

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cevery

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d each

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View Answer all

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


aTrue

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b False

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ceither true and false

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dnone of these

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View Answer False

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


awithin

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b include

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c under

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din

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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

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

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

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

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


aupdate

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binsert

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cdelete

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d drop

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View Answer drop

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