Relational Database Management System Mcqs

Page No. 17

For a n-ary relationship set without arrows, the ________ of the participating entity sets becomes the prime attribute


aIntersection of primary keys


b Primary key of either one


cUnion of primary keys


d Primary key on the many side


View Answer Union of primary keys

For a binary one to one relationship, the ________ of the participating entity sets becomes the prime attribute


aIntersection of primary keys


b Primary key of either one


cUnion of primary keys


dPrimary key on the many side



For a binary many to many relationship, the ________ of the participating entity sets becomes the prime attribute


aIntersection of primary keys


b Primary key of either one


cUnion of primary keys


d Primary key on the many side


View Answer Union of primary keys

The primary key of the representation of a weak entity set consists of the primary key of the strong entity set and the _______


aDiscriminator of the weak entity set


bForeign key


cPrimary key of all the other entity sets


dAll the attributes of the weak entity set



State true or false: Derived attributes cannot be directly represented in the relational data model


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

For schemas derived from strong entity sets, the _______ of the entity set serves as the primary key of the resulting schema


a First attribute


bPrimary key


cForeign key


d None of the mentioned


View Answer Primary key

________ is an abstraction through which relationships are treated as higher level entities


aCreation


bSuperseding


cAttribute separation


dAggregation


View Answer Aggregation

If each higher level entity belongs to the lower level entity, then what kind of generalization is it?


aModal generalization


b Partial generalization


cTotal generalization


dNone of the mentioned


View Answer Total generalization

Condition defined generalization constraint is also said to be ________


aAttribute defined


bConstraint defined


c Value defined


d Undefined


View Answer Attribute defined

Which of the following is not a generalization constraint?


aCondition-defined


b User defined


cDisjoint


dMachine defined


View Answer Machine defined

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