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Question 1

Which of the following are characteristics of a relational database?

Choose all correct options

Data is stored in tables.

Tables must have primary keys.

Relationships are represented by foreign keys.

Tables are hierarchical in structure.

Question 2

What is the main difference between a candidate key and a primary key?

A

Candidate keys are always composite.

B

Candidate keys can serve as a primary key, but only one is chosen.

C

Candidate keys are optional, but primary keys are required.

D

Candidate keys are used for foreign key relationships.

Question 3

In a Bookstore database, a Books table has the following attributes:

ISBN	Title	Author	Price
978-123456	Learning SQL	John Doe	39.99
978-654321	DBMS Basics	Jane Smith	49.99

If you want to ensure that all prices are positive, which integrity constraint should you apply?

A

Domain Integrity

B

Referential Integrity

C

Entity Integrity

D

Functional Dependency

Question 4

Given the following schema for Orders:

Order_ID	Customer_ID	Order_Date	Total_Amount
O101	C001	2024-01-15	100.50
O102	C002	2024-01-16	150.75

Which attribute(s) should you choose as a primary key?

A

Customer_ID

B

Order_ID

C

Both Order_ID and Customer_ID

D

None

Question 5

You have the following Employee table:

Emp_ID	Emp_Name	Dept_ID
101	Alice	D01
102	Bob	D02
103	Charlie	NULL

Which relational integrity constraint is violated if a Dept_ID in the Employee table must reference an existing Department table?

A