Data Modeling

What is the primary purpose of a class diagram?

• To visualize the flow of data in a system

• To represent the structure and behavior of a system's classes

• To illustrate the relationships between entities in a database

• To model the sequence of actions in a business process

What is the purpose of an entity-relationship diagram (ERD)?

• To represent the structure of classes in object-oriented programming

• To illustrate the flow of data between different components of a system

• To model the entities and relationships in a database

• To visualize the sequence of events in a business process

Which of the following is NOT a type of relationship in an entity-relationship diagram (ERD)?

• One-to-one

• Many-to-many

• One-to-many

• Single-to-multiple

Which of the following statements about entities in an entity-relationship diagram (ERD) is true?

• Entities represent attributes of a database table

• Entities represent objects in object-oriented programming

• Entities represent the relationships between database tables

• Entities represent instances of a class

What does the "multiplicity" in a UML class diagram represent?

• The number of attributes in a class

• The number of instances of a class

• The minimum and maximum number of associations between classes

• The type of relationship between classes

What is the purpose of a generalization relationship in a UML class diagram?

• To represent an association between classes

• To model the inheritance hierarchy between classes

• To show dependencies between classes

• To indicate aggregation between classes

What does a composition relationship in a UML class diagram signify?

• A strong relationship where one class owns the other class

• A weak relationship where both classes share ownership

• An association where one class depends on the other class

• An aggregation where both classes have independent lifecycles

Inheritance in object-oriented programming (OOP) allows:

• A class to have multiple parents

• A class to inherit properties and behavior from another class

• A class to override methods of its parent class

• A class to access private members of its parent class