49 Questions | By Sonfackjoyce677 | Last updated: Mar 21, 2022 | Total Attempts: 157
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Do you know what is database management? Database management allows the user to organize, store and retrieve information from a computer. It can also describe the data storage, operations, and security practices of a database administrator. This quiz will require you to know things like how entity subtypes and supertypes are organized in a specialization hierarchy and important inheritance characteristics. This quiz will teach you about database management and what it entails.
1.
Entity supertypes and subtypes are organized in a specialization hierarchy.
A.
True
B.
False
2.
Within a specialization hierarchy, a supertype can exist only within the context of a subtype.
A.
True
B.
False
3.
The entity supertype contains the common characteristics and the entity subtypes contain the unique characteristics of each entity subtype.
A.
True
B.
False
4.
The property of the subtype discriminator enables an entity supertype to inherit the attributes and relationships of the subtype.
A.
True
B.
False
5.
One important inheritance characteristic is that all entity subtypes inherit their primary key attribute from their supertype.
A.
True
B.
False
6.
At the implementation level, the supertype and its subtype(s) depicted in the specialization hierarchy maintain a 1:1 relationship.
A.
True
B.
False
7.
Entity subtypes do not inherit the relationships in which the supertype entity participates.
A.
True
B.
False
8.
In specialization hierarchies with multiple levels of supertype/subtypes, a lower-level supertype inherits all of the attributes and relationships from all of its upper-level subtypes.
A.
True
B.
False
9.
An entity supertype can have disjoint or overlapping entity subtypes.
A.
True
B.
False
10.
Overlapping subtypes are subtypes that contain a unique subset of the supertype entity set.
A.
True
B.
False
11.
Disjoint subtypes are subtypes that contain nonunique subsets of the supertype entity set.
A.
True
B.
False
12.
Implementing non-overlapping subtypes requires the use of one discriminator attribute for each subtype.
A.
True
B.
False
13.
The completeness constraint can be partial or total.
A.
True
B.
False
14.
Generalization is based on grouping unique characteristics and relationships of the subtypes.
A.
True
B.
False
15.
Specialization is the top-down process of identifying lower-level, more specific entity subtypes from a higher-level entity supertype.
A.
True
B.
False
16.
An entity cluster is a "virtual" entity type used to represent multiple entities and relationships in the ERD.
A.
True
B.
False
17.
To model time-variant data, you must create a new entity in an M:N relationship with the original entity.
A.
True
B.
False
18.
A design trap occurs when a relationship is improperly or incompletely identified and, therefore, is represented in a way that is not consistent with the real world.
A.
True
B.
False
19.
Some designs use redundant relationships as a way to simplify the design.
A.
True
B.
False
20.
The extended entity relationship model (EERM) is sometimes referred to as the ____.
A.
Entity relationship model
B.
Enhanced entity relationship model
C.
Entity clustering relationship model
D.
Extended entity relationship diagram
21.
____ is a generic entity type that is related to one or more entity subtypes.
A.
A subtype discriminator
B.
Inheritance
C.
A specialization hierarchy
D.
An entity supertype
22.
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and lower-level entity subtypes (child entities).
A.
Subtype discriminator
B.
Inheritance
C.
Specialization hierarchy
D.
Entity supertype
23.
The relationships depicted within the ____ are sometimes described in terms of "is-a" relationships.
A.
Subtype discriminator
B.
Inheritance
C.
Specialization hierarchy
D.
Entity supertype
24.
Every subtype can have ____ supertype(s) to which it is directly related.
A.
Zero
B.
Only one
C.
One or many
D.
Many
25.
A specialization hierarchy can have ____ level(s) of supertype/subtype relationships.
A.
Zero
B.
Only one
C.
One or many
D.
Many
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