3335. HR: Find the median salary by department. — Security

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

In a hr module, solve this as a production problem using Security: Find the median salary by department. Provide the SQL, explain the logic, show safe application integration, and mention failure/edge cases.

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Answer & Explanation

4 Answers

Verified

Option A

UPDATE table_name SET status='active';

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

Verified

Option B

SELECT * FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.

Verified Correct Answer

Option C

WITH x AS (SELECT dept_id,salary,ROW_NUMBER() OVER(PARTITION BY dept_id ORDER BY salary) rn,COUNT(*) OVER(PARTITION BY dept_id) cnt FROM employees) SELECT dept_id,AVG(salary) median_salary FROM x WHERE rn IN (FLOOR((cnt+1)/2),CEIL((cnt+1)/2)) GROUP BY dept_id;

Additional Explanation

The two middle rows are averaged for even-sized groups.

Verified

Option D

DELETE FROM table_name;

Additional Explanation

Incorrect: it does not satisfy the stated business rule and can return/change unintended data.