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SQL Interview Series — Part 17 📌 Question 17: Find the Second-Highest Salary in Each Department Suppose you have an Employee table: employee_id | employee_name | department | salary ------------|---------------|------------|------- 1 | Amit | IT | 50000 2 | Rahul | IT | 90000 3 | Priya | IT | 70000 4 | Neha | HR | 60000 5 | Raj | HR | 80000 6 | Karan | HR | 100000 ❓ Question Find the second-highest distinct salary in each department. 💡 Approach We need to rank salaries separately within …

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SQL Interview Series — Part 16 📌 Question 16: Find and Remove Duplicate Records While Keeping the Latest Record Suppose you have a CustomerOrders table: order_id | customer_id | order_date | amount ---------|-------------|-------------|------- 101 | 1 | 2026-01-05 | 500 102 | 1 | 2026-02-10 | 800 103 | 2 | 2026-01-15 | 400 104 | 2 | 2026-03-01 | 900 105 | 3 | 2026-02-20 | 700 Assume each customer_id should have only one record, and we want to keep the latest record for each customer. ❓ Ques…

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SQL Interview Series — Part 13 📌 Question 13: Find Employees Earning More Than the Company Average Suppose you have an Employee table: employee_id | employee_name | department | salary ------------|---------------|------------|------- 1 | Amit | IT | 50000 2 | Rahul | IT | 80000 3 | Priya | HR | 60000 4 | Neha | HR | 90000 5 | Raj | Finance | 70000 ❓ Find all employees whose salary is greater than the average salary of the entire company. 💡 Approach First, calculate the average salary acro…

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