2730. Education: Find students who scored above their class average. — Java Spring/JDBC

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

In a education module, solve this as a production problem using Java Spring/JDBC: Find students who scored above their class average. 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

DELETE FROM table_name;

Additional Explanation

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

Verified

Option C

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 D

SELECT s.* FROM students s WHERE s.marks>(SELECT AVG(s2.marks) FROM students s2 WHERE s2.class_id=s.class_id);

Additional Explanation

The correlated average is calculated for the student's own class.