Database _Quiz

Which of the following is a good example of a many-to-many relationship?

• Students and courses

• Employees and departments

• Products and orders

• All of the above

Which of the following is NOT a component of an ERD?

• Entity

• Attribute

• Relationship

• Table

What is a foreign key in a database?

• A key used for encryption of sensitive data

• A key that uniquely identifies each record in a table

• A key that establishes a link between two tables

• A key used for indexing purposes

Which one is not considered as a weak entity:

• • Shipment of an order

• • Dependent of an employee

• Book Copy in a library database

• Customer in a company database

Which of the following is a benefit of using entity supertypes and subtypes?

• They can help to improve the performance of database queries.

• They can make database designs more modular

• They can help to reduce null values

• All of the above