Relational Database Management System Mcqs

Page No. 15

State true or false: We cannot specify keys in the Entity-Relationship model


aTrue


b False


ceither true of false


dnone of these


View Answer False

Let E be an entity set in a relationship set R. If only some entities in E participate in relationships in R, Then the participation of E in R is __________


aPartial


bTotal


c Complete


dIncomplete


View Answer Total

Let E be an entity set in a relationship set R. If every entity in E participates in at least one relationships in R, Then the participation of E in R is __________


aPartial


bTotal


cComplete


d Incomplete


View Answer Total

What are composite attributes?


aThey are those attributes which cannot be further divided into other attributes


bThey are those attributes which can further be divided into other attributes


cThey are those attributes which are essentially the primary keys of the relation


dNone of the mentioned



The attributes of a relationship are called as _________ attributes


aRelational


b Conjunctive


cDescriptive


dNone of the mentioned


View Answer Descriptive

A ___________ is an association among several entities.


aRelationship


bAssociation


cSet


dCombination


View Answer Relationship

The _________ of the entity set is an actual collection of entities belonging to that entity set.


aExtension


b Intention


cDescription


dAvailability


View Answer Extension

State true or false: A weak entity can participate in all the relationships.


a True


bFalse


ceither true of false


dnone of these


View Answer False

State true or false: Every weak entity set must be associated with an identifying entity


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

The relationship associating the weak entity sets with the identifying entity set is called as ________


aIdentifying relationship


bConnecting relationship


cCompleting relationship


d Unique relationship



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