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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