ch 3 Flashcards
What are the two major types of business process models?
Activity and structure
The structure model is what
(data) describe the information structure of the process
Create a blueprint for the development of a relational database
The structure model describes the — and the – in the domain of interest
entities; things
Class diagrams are what?
separately identifiable collections of entities in which the organization wants to collect and store information
Define Associations
depict the relationship between two classes
Example of association
person –> auto
Means: that a person owns an auto
What are multiplicities
describe the minimum and maximum number of times one class can be associated with another class
Define these multiplicities
1) 0..1
2) 1..1
3) 0..*
4) 1..*
1) Zero or one
2) one only
3) zero or more
4) one or more
What are the characteristics of a table
- attributes
- primary keys
- foreign keys
What are attributes?
elments that describe characteristics of classes or rows in a table
The primary key is what?
uniquely define instances of a class or row
Foreign keys
Allows tables to be linked
Like data in one datd to another table
can a primary key be null? what is null?
NO; null means blank
Which of the following symbols is used to represent a class in a UML class diagram
Rectangle
Contrast the UML class diagrams with the entity relationships, which of the following is not equivalent?
Class and entity
association and relationship
multiplicity and cardinality
Class and relationship
Class and relationship
