📌10 intermediate-level SQL interview questions

1. How would you find the nth highest salary in a table?
2. What is the difference between JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN?
3. How would you calculate cumulative sum in SQL?
4. How do you identify duplicate records in a table?
5. Explain the concept of a window function and give examples.
6. How would you retrieve records between two dates in SQL?
7. What is the difference between UNION and UNION ALL?
8. How can you pivot data in SQL?
9. Explain the use of CASE statements in SQL.
10. How do you use common table expressions (CTEs)?

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