IT 380 A+: EXAM 1 ENGAGING THE LATEST UPDATE OF
QUESTIONS AND ANSWERS.
Disjoint
Each instance can be only one of the subtypes
Overlapping
Each instance maybe more than one subtype
Partial
An Instance of a supertype does not have to have a subtype
Total
An instance of a supertype must belong to a subtype
1NF
Identify primary key
No repeating groups or columns
No multi-valued attribute
2NF
No partial dependencies
1NF
3NF
No transitional dependencies
Polymorphism
Concept that a message gives different meanings to different objects
BCNF is an extension of:
3NF
An external entity initiates a use case by requesting the system to perform a
function or process. What is another name for the external entity?
Actor
In ERDs, what enables an object to derive one or more of its attributes from
another object?
Inheritance
QUESTIONS AND ANSWERS.
Disjoint
Each instance can be only one of the subtypes
Overlapping
Each instance maybe more than one subtype
Partial
An Instance of a supertype does not have to have a subtype
Total
An instance of a supertype must belong to a subtype
1NF
Identify primary key
No repeating groups or columns
No multi-valued attribute
2NF
No partial dependencies
1NF
3NF
No transitional dependencies
Polymorphism
Concept that a message gives different meanings to different objects
BCNF is an extension of:
3NF
An external entity initiates a use case by requesting the system to perform a
function or process. What is another name for the external entity?
Actor
In ERDs, what enables an object to derive one or more of its attributes from
another object?
Inheritance
