Coding Interview

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🔥 SQL Interview Case Studies (Advanced Business Scenarios) 💯 🧠 Case Study 1: Find Repeat Customers 📊 Orders Table order_id customer_id 1 101 2 102 3 101 ❓ Business Question Find customers who placed more than 1 order. ✅ Solution SELECT customer_id, COUNT(*) AS total_orders FROM orders GROUP BY customer_id HAVING COUNT(*) > 1; 🧠 Case Study 2: Highest Paid Employee Per Department ❓ Business Question Find highest paid employee in every department. ✅ Solution WITH RankedEmployees AS ( SELECT *, ROW_NUMBER() OVER( PARTITION BY department ORDER BY salary DESC ) rn FROM employees ) SELECT * FROM RankedEmployees WHERE rn = 1; 🧠 Case Study 3: Find Inactive Customers ❓ Business Question Customers who haven't ordered in the last 6 months. ✅ Solution SELECT c.customer_id, c.name FROM customers c LEFT JOIN orders o ON c.customer_id = o.customer_id GROUP BY c.customer_id, c.name HAVING MAX(o.order_date) < DATE_SUB(CURDATE(), INTERVAL 6 MONTH); 🧠 Case Study 4: Product Generating Highest Revenue 📊 Sales Table product_id amount ✅ Solution SELECT product_id, SUM(amount) AS revenue FROM sales GROUP BY product_id ORDER BY revenue DESC LIMIT 1; 🧠 Case Study 5: Employee Salary Above Department Average ✅ Solution WITH DeptAvg AS ( SELECT department, AVG(salary) avg_salary FROM employees GROUP BY department ) SELECT e.* FROM employees e JOIN DeptAvg d ON e.department = d.department WHERE e.salary > d.avg_salary; 🧠 Case Study 6: Running Total Sales ❓ Business Question Calculate cumulative sales. ✅ Solution SELECT order_date, amount, SUM(amount) OVER( ORDER BY order_date ) AS running_total FROM sales; 🧠 Case Study 7: Top 3 Products Per Category ✅ Solution WITH RankedProducts AS ( SELECT *, ROW_NUMBER() OVER( PARTITION BY category ORDER BY sales DESC ) rn FROM products ) SELECT * FROM RankedProducts WHERE rn <= 3; 🎯 Practice Tasks 1️⃣ Find customer with highest number of orders 2️⃣ Find lowest salary employee per department 3️⃣ Find products never sold 4️⃣ Find departments with average salary > company average 5️⃣ Find month with lowest sales ⚡ Mini Challenge 🔥 Banking Scenario Tables: Accounts account_id customer_name Transactions transaction_id account_id amount transaction_date Question 👉 Find the top 3 customers with highest total transaction amount in the last 1 year. 🔥 Interview Tip When solving case studies: 1️⃣ Understand business question 2️⃣ Identify tables 3️⃣ Identify JOINs 4️⃣ Identify Aggregations 5️⃣ Decide whether Window Function is needed Double Tap ❤️ For More

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