✅ Relational Data Model – Important PYQs

⭐ 1 Mark / Very Short Questions

1. Define Relational Model.

2. What is Relation?

3. What is Tuple?

4. What is Attribute?

5. Define Degree of relation.

6. Define Cardinality.

7. What is Domain?

8. Define Primary Key.

9. What is Foreign Key?

10. What is Candidate Key?

11. Define Super Key.

12. What is Composite Key?

13. What is NULL value?

14. Define Integrity Constraints.

15. What is Referential Integrity?

⭐ 2–3 Marks Questions (Short Notes)

1. Difference between File System and DBMS.

2. Explain Relational Schema with example.

3. Write short note on:

   • Primary Key

   • Foreign Key

   • Candidate Key

4. Explain Domain constraint.

5. Explain Entity Integrity.

6. Explain Referential Integrity.

7. What are constraints in relational model?

8. Difference between Degree and Cardinality.

9. What is relational instance?

10. Explain properties of relations.

⭐ 5 Marks Questions (Important Theory)

Very Frequently Asked (⭐ Most Important)

1. Explain Relational Data Model with diagram.

2. Explain different types of Keys in DBMS.

3. Explain Integrity Constraints in relational model.

4. What are advantages of Relational Model?

5. Explain Codd’s rules.

6. Difference between:

   • Primary Key vs Candidate Key

   • Super Key vs Candidate Key

   • Tuple vs Attribute

7. Explain Schema and Instance with example.

8. Write note on:

   • Domain

   • Keys

   • Constraints

9. Explain relational database structure.

⭐ 8–10 Marks Questions (Long / Numerical / Practical)

🔥 Most Repeated in Exams

Q1. Explain Relational Model in detail.

• Concepts

• Structure

• Keys

• Constraints

• Example

Q2. Given a relation, find:

Example:
STUDENT (Roll, Name, Email, Phone, Dept)

Find:

• Candidate Key

• Primary Key

• Super Keys

Q3. Explain Integrity Constraints with examples:

• Domain Constraint

• Entity Integrity

• Referential Integrity

Q4. Solve problems:

Given:
EMP(Eid, Ename, DeptId)
DEPT(DeptId, Dname)

Questions:

• Identify primary key

• Identify foreign key

• Explain relationship

Q5. Write short notes on:

• Relational Algebra basics

• Tuple relational calculus

• Domain relational calculus

(Usually comes with relational model unit)

⭐ Diagram Based Questions

Very common:

1. Draw relational schema of:

   • Student Management System

   • Library System

   • Bank System

2. Convert ER model to relational schema.

⭐ Viva / Interview Questions (Relational Model)

Since you also prepare for job interviews, these are helpful:

👉 What is relational database?
👉 Why primary key cannot be null?
👉 Can foreign key be null?
👉 Difference between candidate key and super key?
👉 Why relational model is popular?
👉 Real-life example of relation?