ISCC105: QUIZ 3

What does ERD stand for?

• Entity-Relation Diagram
  

• Entity-Relationship Diagram
  

• Entity-Relational Data
  

• Entity-Resource Diagram

In an ERD, what does an entity represent?

• A relationship between data

• An object or concept in the real world

• A data attribute

• A process in a system

TRUE or FALSE

Relationships in an ERD only connect two entities.

Which of the following is typically used to represent attributes in an ERD?

• Ellipse

• Rectangle

• Diamond

• Line

In an ERD, which shape is used to represent an entity?

• Rectangle

• Diamond

• Circle

• Triangle

Which of the following best describes a "primary key"?

• A unique identifier for an entity

• A relationship between two entities

• A common attribute shared by entities

• A descriptive attribute of an entity

TRUE or FALSE

A relationship in an ERD can be one-to-one, one-to-many, or many-to-many.

What type of cardinality indicates that one entity instance in a relationship can relate to many instances of another entity?

• One-to-one

• One-to-many

• Many-to-one

• Many-to-many

What symbol represents a relationship in an ERD?

• Ellipse

• Rectangle

• Diamond

• Arrow

In a one-to-many relationship, where should the foreign key be placed?

• In the "one" entity

• In the "many" entity

• In both entities

• No foreign key is needed