Database Management Systems Mcqs

Page No. 22

Which of the following is another name for a weak entity?


aChild


bOwner


cDominant


dAll of the mentioned


View Answer Child

Functional dependencies are a generalization of


aKey dependencies


bRelation dependencies


cDatabase dependencies


dNone of the mentioned


View Answer Key dependencies

The completeness constraint may be one of the following: Total generalization or specialization, Partial generalization or specialization. Which is the default?


aTotal


bPartial


cShould be specified


dCannot be determined


View Answer Partial

Consider the employee work-team example, and assume that certain employees participate in more than one work team. A given employee may therefore appear in more than one of the team entity sets that are lower level entity sets of employee. Thus, the generalization is _____________


aOverlapping


bDisjointness


cUniqueness


dRelational


View Answer Overlapping

A _____________ constraint requires that an entity belong to no more than one lower-level entity set.


aDisjointness


bUniqueness


cSpecial


dRelational


View Answer Disjointness

If an entity set is a lower-level entity set in more than one ISA relationship, then the entity set has


aHierarchy


bMultilevel inheritance


cSingle inheritance


dMultiple inheritance


View Answer Multiple inheritance

There are similarities between the instructor entity set and the secretary entity set in the sense that they have several attributes that are conceptually the same across the two entity sets: namely, the identifier, name, and salary attributes. This process is called


aCommonality


bSpecialization


cGeneralization


dSimilarity


View Answer Generalization

The refinement from an initial entity set into successive levels of entity subgroupings represents a ________ design process in which distinctions are made explicit.


aHierarchy


bBottom-up


cTop-down


dRadical


View Answer Top-down

Which relationship is used to represent a specialization entity?


aISA


bAIS


cONIS


dWHOIS


View Answer ISA

The entity set person is classified as student and employee. This process is called _________


aGeneralization


bSpecialization


cInheritance


dConstraint generalization


View Answer Specialization

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