#DatabaseInterview

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Top SQL Interview Questions and Answers for Freshers and Professionals

SQL is the foundation of data-driven applications. Whether you’re applying for a data analyst, backend developer, or database administrator role, having a solid grip on SQL interview questions is essential for cracking technical rounds.

In this blog post, we’ll go over the most commonly asked SQL questions along with sample answers to help you prepare effectively.

📘 Want a complete, updated list of SQL interview questions? 👉 Check out: SQL Interview Questions & Answers – Freshy Blog

🔹 What is SQL?

SQL (Structured Query Language) is used to communicate with and manipulate databases. It is the standard language for relational database management systems (RDBMS).

🔸 Most Common SQL Interview Questions

1. What is the difference between WHERE and HAVING clause?

WHERE: Filters rows before grouping

HAVING: Filters groups after aggregation

2. What is a Primary Key?

A primary key is a unique identifier for each record in a table and cannot contain NULL values.

3. What are Joins in SQL?

Joins are used to combine rows from two or more tables based on a related column. Types include:

INNER JOIN

LEFT JOIN

RIGHT JOIN

FULL OUTER JOIN

🔸 Intermediate to Advanced SQL Questions

4. What is the difference between DELETE, TRUNCATE, and DROP?

DELETE: Removes rows (can be rolled back)

TRUNCATE: Removes all rows quickly (cannot be rolled back)

DROP: Deletes the table entirely

5. What is a Subquery?

A subquery is a query nested inside another query. It is used to retrieve data for use in the main query.

6. What is normalization?

Normalization is the process of organizing data to reduce redundancy and improve integrity.

🚀 Get a full breakdown with examples, tips, and pro-level questions: 👉 https://www.freshyblog.com/sql-interview-questions-answers/

🔍 Bonus Questions to Practice

What is the difference between UNION and UNION ALL?

What are indexes and how do they improve performance?

How does a GROUP BY clause work with aggregate functions?

What is a stored procedure and when would you use one?

✅ Tips to Crack SQL Interviews

Practice writing queries by hand

Focus on real-world database scenarios

Understand query optimization basics

Review basic RDBMS concepts like constraints and keys

Final Thoughts

Whether you're a fresher starting out or an experienced developer prepping for technical rounds, mastering these SQL interview questions is crucial for acing your next job opportunity.

📚 Access the full SQL interview guide here: 👉 https://www.freshyblog.com/sql-interview-questions-answers/