💡 SQL Interview Question: 👉 How do you display employees along with their managers? This is one of the most asked SQL questions to test self-join concepts. Here’s the clean SQL query 👇 SELECT e.employee_name AS employee, m.employee_name AS manager FROM employees e LEFT JOIN employees m ON e.manager_id = m.employee_id; 🎯 Explanation: - The employees table is joined with itself - e represents employee - m represents manager - manager_id in employee row maps to manager’s employee_id - LEFT JOIN
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💡 SQL Interview / Real-Time Question: 👉 How do you display each department’s total salary? Here’s the simple & powerful SQL query 👇 SELECT department, SUM(salary) AS total_salary FROM employees GROUP BY department; 🎯 Explanation: - GROUP BY department → groups all employees under each department - SUM(salary) → calculates total salary for every group - Used in HR, Payroll, Analytics, Reporting, and Backend systems This is a must-know SQL query for: ✔️ Java developers ✔️ Full Stack learners ✔
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