1977. Employees above department average — School ERP — implementation variant 27

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

In a School ERP application, implement this production problem: Find employees whose salary is above their department's average. The API/service receives user input and must return or modify data safely. Give the SQL solution, explain why it works, and show how the same operation is called from the selected stack.

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Answer & Explanation

4 Answers

Verified

Option A

UPDATE the_table SET status='active';

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified

Option B

SELECT * FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified Correct Answer

Option C

SELECT e.id,e.name,e.dept_id,e.salary FROM employees e WHERE e.salary > (SELECT AVG(e2.salary) FROM employees e2 WHERE e2.dept_id=e.dept_id);

Additional Explanation

The correlated subquery calculates the comparison average for the employee's own department.

Verified

Option D

DELETE FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.