ER Modeling Quiz

What is an Entity Relationship Diagram (ERD)?

• A diagram that represents the flow of data in a system.

• A visual representation of the relationships between entities in a database.

• A diagram that illustrates the hierarchy of data in a database.

• A diagram that shows the physical structure of a database.

What is cardinality in ER modeling?

• Cardinality in ER modeling refers to the color coding used to represent entities.

• Cardinality in ER modeling refers to the size of the entities involved.

• Cardinality in ER modeling refers to the order in which entities are listed in a diagram.

• Cardinality in ER modeling refers to the number of instances of one entity that can be associated with the number of instances of another entity.

What are attributes in ER modeling?

• Attributes in ER modeling are the relationships between entities.

• Attributes in ER modeling are the properties or characteristics of an entity.

• Attributes in ER modeling are the actions performed by entities.

• Attributes in ER modeling are the identifiers of entities.

What is a relationship in ER modeling?

• A relationship in ER modeling is a connection or association between two or more entities.

• A relationship in ER modeling is a constraint that ensures data integrity in a database.

• A relationship in ER modeling is a way to represent inheritance between entities.

• A relationship in ER modeling is a data type used to store multiple values in a single attribute.

What is the purpose of an Entity Relationship Diagram (ERD)?

• To analyze the performance of a computer network.

• To organize data in a spreadsheet format.

• To create a graphical representation of a website's layout.

• To visually represent the relationships between entities in a database.

What are the different types of cardinality in ER modeling?

• one-to-one (1:1), one-to-many (1:N), and many-to-one (N:1).

• one-to-one (1:1), one-to-many (1:N), and many-to-many (N:N)

• one-to-one (1:1), one-to-many (1:N), and many-to-many (N:N).

• one-to-one (1:1), many-to-one (N:1), and many-to-many (N:N).

• one-to-many (1:N), many-to-one (N:1), and many-to-many (N:N).

What are the different types of relationships in ER modeling?

• one-to-one, one-to-many, and many-to-many.

• one-to-one, one-to-one, and many-to-many.

• one-to-one, one-to-many, and one-to-one.

• one-to-many, one-to-many, and many-to-many.

• one-to-one, one-to-many, and many-to-many

What is the difference between a weak and strong entity in ER modeling?

• A weak entity can exist independently, while a strong entity always depends on other entities.

• A weak entity has a primary key, while a strong entity does not have a primary key.

• A weak entity has a one-to-one relationship with other entities, while a strong entity has a one-to-many relationship with other entities.

• The difference between a weak and strong entity in ER modeling is that a weak entity cannot be uniquely identified by its own attributes and depends on the existence of another entity, while a strong entity can be uniquely identified by its own attributes and does not depend on the existence of any other entity.

What is the role of attributes in an Entity Relationship Diagram (ERD)?

• Attributes in an ERD represent the relationships between entities.

• Attributes in an ERD are used to represent the actions performed by entities.

• Attributes in an ERD are used to define the primary key of an entity.

• Attributes in an ERD represent the properties or characteristics of an entity.

How can you represent a many-to-many relationship in an ER diagram?

• Using a triangle shape labeled with cardinality.

• Using a circle shape labeled with cardinality.

• Using a square shape labeled with cardinality.

• Using a diamond shape labeled with cardinality