Below are some sample SQL interview questions categorized into basic, intermediate, and advanced levels for a fresher candidate: Basic SQL Interview Questions: 1. What is SQL and why is it important? 2. Explain the difference between SQL and MySQL. 3. What are the basic SQL commands? 4. How do you retrieve all columns from a table named "employees"? 5. Explain the SELECT statement in SQL. 6. What is a primary key? 7. Define the term normalization in the context of databases. 8. How do you insert data into a table? 9. Explain the concept of foreign keys. 10. What is the purpose of the WHERE clause in SQL? Intermediate SQL Interview Questions: 11. Write a SQL query to find the second-highest salary from an "employees" table. 12. Explain the difference between INNER JOIN and LEFT JOIN. 13. What is a subquery? Provide an example. 14. How can you prevent SQL injection in your queries? 15. Write a query to count the number of rows in a table. 16. Explain the concept of in...