er model

Which of the following is an example of an entity?

• Customer ID
• Customer Name
• Order Date
• Order Quantity

What is an entity set in an entity-relationship model?

• A collection of entities that share common attributes
• A collection of relationships that share common attributes
• A collection of properties that share common attributes
• A collection of entities that are not related

[Remember] What is an entity in ER model?

• A. A database
• B. A set of attributes
• C. A representation of a real-world object
• D. A relationship

[Remember] What is a relationship in ER model?

• A. A database
• B. A set of attributes
• C. A representation of a real-world object
• D. A connection

[Remember] What are attributes in ER model?

• A. Database schema
• B. Real-world objects
• C. Data types and constraints
• D. Characteristics

[Understand] How is an entity represented in ER model?

• A. As a rectangle
• B. As a circle
• C. As a diamond
• D. As a line

[Understand] What is a weak entity in ER model?

• A. An entity with a primary key
• B. An entity with no primary key
• C. An entity that depends on another entity
• D. An entity with a derived attribute

[Understand] What is a composite attribute in ER model?

• A. An attribute that can be further divided
• B. An attribute that is unique
• C. An attribute that is a foreign key
• D. An attribute that is a primary key

[Remember] What is the purpose of an ER model?

• A. To display data
• B. To design a database schema
• C. To create database tables
• D. To insert data

[Remember] What is a multivalued attribute in ER model?

• A. An attribute with a single value
• B. An attribute that cannot be null
• C. An attribute with more than one value
• D. An attribute that is a key