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Here’s the clean SQL query 👇
SELECT employee_id,
employee_name,
department_id
FROM employees
WHERE department_id IN (
SELECT department_id
FROM departments
WHERE location = 'HYDERABAD'
);
🎯 Explanation:
The subquery executes first and returns a list of department_ids
The outer query filters employees whose department_id matches that list
The subquery is non-correlated (it does not depend on the outer query)
IN is used when the subquery returns multiple values
Clean and easy to read — very common in interviews
✅ Perfect for:
✔️ SQL Interviews
✔️ Backend Developers
✔️ Java + Spring Boot Learners
✔️ Data Analysts
✔️ Reporting & Business Queries
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This is a Question Papers of Mumbai University for B.Sc.IT Student of Semester - III [Advanced SQL] (Revised Course). [Year - April / 2014] . . .Solution Set of this Paper is Coming soon...