Database Management Systems Mcqs

Page No. 7

SELECT __________ FROM instructor WHERE dept name= ’Comp. Sci.’;
Which of the following should be used to find the mean of the salary ?


aMean(salary)

✖


bAvg(salary)

✓


cSum(salary)

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dCount(salary)

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View Answer Avg(salary)

Aggregate functions are functions that take a ___________ as input and return a single value.


aCollection of values

✓


bSingle value

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cSingle value

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dBoth Collection of values & Single value

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View Answer Collection of values

How can you find rows that do not match some specified condition?


aEXISTS

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bDouble use of NOT EXISTS

✓


cNOT EXISTS

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dNone of the mentioned

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The EXISTS keyword will be true if:


aAny row in the subquery meets the condition only

✓


bAll rows in the subquery fail the condition only

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cBoth of these two conditions are met

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dNeither of these two conditions is met

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Which of the following is not an aggregate function?


aAvg

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bSum

✖


cWith

✓


dMin

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View Answer With

Subqueries cannot:


aUse group by or group functions

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bRetrieve data from a table different from the one in the outer query

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cJoin tables

✓


dAppear in select, update, delete, insert statements.

✖


View Answer Join tables

Which of the following creates a temporary relation for the query on which it is defined?


aWith

✓


bFrom

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cWhere

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dSelect

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View Answer With

The ________ keyword is used to access attributes of preceding tables or subqueries in the from clause.


aIn

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bLateral

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cHaving

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dWith

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View Answer Lateral

Aggregate functions can be used in the select list or the_______clause of a select statement or subquery. They cannot be used in a ______ clause.


aWhere, having

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bHaving, where

✓


cGroup by, having

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dGroup by, where

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View Answer Having, where

SQL applies predicates in the _______ clause after groups have been formed, so aggregate functions may be used.


aGroup by

✖


bWith

✓


cWhere

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dHaving

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View Answer With

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