Database Management Systems Mcqs

Page No. 20

Data integrity constraints are used to:


aControl who is allowed access to the data


b Ensure that duplicate records are not entered into the table


cImprove the quality of data entered for a specific property


dPrevent users from changing the values stored in the table



An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A.


aOne-to-many


bOne-to-one


cMany-to-many


dMany-to-one


View Answer Many-to-one

An entity in A is associated with at most one entity in B, and an entity in B is associated with at most one entity in A.This is called as


aOne-to-many


bOne-to-one


cMany-to-many


dMany-to-one


View Answer One-to-one

_____________ express the number of entities to which another entity can be associated via a relationship set.


aMapping Cardinality


bRelational Cardinality


cParticipation Constraints


dNone of the mentioned


View Answer Mapping Cardinality

What term is used to refer to a specific record in your music database; for instance; information stored about a specific album?


aRelation


bInstance


cTable


dColumn


View Answer Instance

If you were collecting and storing information about your music collection, an album would be considered a(n) _____


aRelation


bEntity


cInstance


dAttribute


View Answer Entity

Weak entity set is represented as


aUnderline


bDouble line


cDouble diamond


dDouble rectangle


View Answer Double diamond

For a weak entity set to be meaningful, it must be associated with another entity set, called the


aIdentifying set


bOwner set


cNeighbour set


dStrong entity set


View Answer Identifying set

An entity set that does not have sufficient attributes to form a primary key is termed a __________


aStrong entity set


bVariant set


cWeak entity set


dVariable set


View Answer Weak entity set

We indicate roles in E-R diagrams by labeling the lines that connect ___________ to __________


aDiamond , diamond


bRectangle, diamond


cRectangle, rectangle


dDiamond, rectangle


View Answer Diamond, rectangle

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