SQL Interview Questions and Answers | How to Pass the SQL Interview

Preparing for an SQL interview? In this video, we cover the most commonly asked SQL interview questions with detailed answers to help you succeed. Whether you’re a beginner, intermediate, or experienced professional, these questions will guide you through the fundamentals and advanced concepts of SQL.

You’ll learn about:

Basic SQL queries and syntax
Joins, subqueries, and indexing
Stored procedures, functions, and triggers
Database optimization techniques
Real-world SQL problem-solving examples

This video is perfect for anyone preparing for database developer, data analyst, software engineer, or SQL-related roles.

📌 Watch till the end to boost your confidence and perform well in your next interview!

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1. What Is SQL And What Are Its Main Uses?
2. Explain The Different Types Of SQL Commands (DDL, DML, DCL, TCL).
3. What Is A Primary Key? How Is It Different From A Unique Key?
4. What Is A Foreign Key And Why Is It Important?
5. What Are Indexes In SQL And How Do They Improve Performance?
6. Write A SQL Query To Find The Second Highest Salary From An “Employees” Table.
7. Write A SQL Query To Fetch Duplicate Values From A Column In A Table.
8. How Do You Retrieve The Top N Records From A Table?
9. Write A SQL Query To Find Employees Whose Salary Is Above The Average Salary.
10. Write A SQL Query To Count The Number Of Orders Placed By Each Customer In An "Orders" Table.
11. How Can NULL Values Be Handled In SQL?
12. Write A SQL Query To Update The Salary Of Employees By 10%.
13. What Are GROUP BY And HAVING Clauses? Give An Example.
14. Explain Different Types Of JOINs In SQL. Give Examples.
15. What Is A Subquery? Provide An Example.
16. What Are Window Functions? Write A Query Using A Window Function.
17. What Is A Common Table Expression (CTE)? How Is It Used?
18. Explain The Difference Between UNION And UNION ALL With Examples.
19. What Is Normalization? Describe Different Normal Forms.
20. Write A Query To Pivot A Table To Show Totals By Month For Each Product.
21. What Are ACID Properties In SQL Transactions?
22. What Is The Difference Between Clustered And Non-Clustered Indexes?
23. What Is A Trigger? Give An Example Use Case.
24. What Is A Stored Procedure? Write A Basic Example For Returning Order History By Customer.
25. What Are Common Data Types In SQL And Why Is Data Type Selection Important?

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