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SQL interview questions: 1. What is the purpose of the GROUP BY clause in SQL? Provide an example. 2. Explain the difference between an INNER JOIN and a LEFT JOIN with examples. 3. Discuss the role of the WHERE clause in SQL queries and provide examples of its usage. 4. Explain the concept of database transactions and the ACID properties. 5. Describe the benefits of using subqueries in SQL and provide a scenario where they would be useful. 6. Discuss the differences between the CHAR and VARCHAR data types in SQL. 7. Explain the purpose of the ORDER BY clause in SQL queries and provide examples. 8. Describe the importance of data integrity constraints such as NOT NULL, UNIQUE, and CHECK constraints in SQL databases. 9. Discuss the advantages and disadvantages of using stored procedures Explain the difference between an aggregate function and a scalar function in SQL, with examples. 10. Discuss the role of the COMMIT and ROLLBACK statements in SQL transactions. 11. Explain the purpose of the LIKE operator in SQL and provide examples of its usage. 12. Describe the concept of normalization forms (1NF, 2NF, 3NF) and why they are important in database design. 13. Discuss the differences between a clustered and non-clustered index in SQL. 14. Explain the concept of data warehousing and how it differs from traditional relational databases. 15. Describe the benefits of using database triggers and provide examples of their usage. 16. Discuss the concept of database concurrency control and how it is achieved in SQL databases. 17. Explain the role of the SELECT INTO statement in SQL and provide examples of its usage. 18. Describe the differences between a database view and a materialized view in SQL. 19. Discuss the advantages of using parameterized queries in SQL applications. 20. Write a query to retrieve all employees who have a salary greater than $100,000. 21. Create a query to display the total number of orders placed in the last month. 22. Write a query to find the average order value for each customer. 23. Create a query to count the number of distinct products sold in the past week. 24. Write a query to find the top 10 customers with the highest total order amount.

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SQL Server Database Tutorial Basic and advance concept

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