Database Management Systems Mcqs

Page No. 5

The number of attributes in relation is called as its


aCardinality


bDegree


cTuples


dEntity


View Answer Degree

If we want to retain all duplicates, we must write ________ in place of union.


aUnion all


bUnion some


cIntersect all


dIntersect some


View Answer Union all

The union operation automatically __________ unlike the select clause.


aAdds tuples


bEliminates unique tuples


cAdds common tuples


dEliminates duplicate


View Answer Eliminates duplicate

The intersection operator is used to get the _____ tuples.


aDifferent


bCommon


cAll


dRepeating


View Answer Common

The union operation is represented by


a


bU


c


d*


View Answer U

The result of _____unknown is unknown.


aXor


bOr


cAnd


dNot


View Answer Not

You attempt to query the database with this command:
SELECT nvl (100 / quantity, NONE) FROM inventory;
Why does this statement cause an error when QUANTITY values are null?


aThe expression attempts to divide by a null value


bThe data types in the conversion function are incompatible


cThe character string none should be enclosed in single quotes (‘ ‘)


dA null value used in an expression cannot be converted to an actual value



The primary key must be


aUnique


bNot null


cBoth Unique and Not null


dEither Unique or Not null



Using the ______ clause retains only one copy of such identical tuples.


aNull


bUnique


cNot null


dDistinct


View Answer Distinct

In an employee table to include the attributes whose value always have some value which of the following constraint must be used?


aNull


bNot null


cUnique


dDistinct


View Answer Not null

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