Databases 1
INF2603
Quiz 6
Assessment 9
Unique Number: 769930
Department of Information Systems
, Question 1
Overlapping subtypes are subtypes that contain ____ subsets of the supertype entity
set.
a. nonunique
b. entity
c. subtypes
d. unique
Question 2
The entity supertype contains the common characteristics and the entity subtypes
contain the unique characteristics of each entity subtype.
Select one:
True
False
Question 3
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and
lower-level entity subtypes (child entities).
a. inheritance
b. entity supertype
c. specialisation hierarchy
d. subtype discriminator
Question 4
If one exists, a data modeler uses a ____ as the primary key of the entity being modeled.
a. combination key
b. natural identifier
c. surrogate key
d. foreign key
INF2603
Quiz 6
Assessment 9
Unique Number: 769930
Department of Information Systems
, Question 1
Overlapping subtypes are subtypes that contain ____ subsets of the supertype entity
set.
a. nonunique
b. entity
c. subtypes
d. unique
Question 2
The entity supertype contains the common characteristics and the entity subtypes
contain the unique characteristics of each entity subtype.
Select one:
True
False
Question 3
The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and
lower-level entity subtypes (child entities).
a. inheritance
b. entity supertype
c. specialisation hierarchy
d. subtype discriminator
Question 4
If one exists, a data modeler uses a ____ as the primary key of the entity being modeled.
a. combination key
b. natural identifier
c. surrogate key
d. foreign key
