3862. Education: Calculate subject-wise pass rate. — Reporting

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

In a education module, solve this as a production problem using Reporting: Calculate subject-wise pass rate. 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 Correct Answer

Option B

SELECT subject_id,100*AVG(marks>=:pass_marks) pass_rate FROM exam_results GROUP BY subject_id;

Additional Explanation

MySQL boolean expressions can be averaged to get a percentage; CASE can be used for portability.

Verified

Option C

DELETE FROM table_name;

Additional Explanation

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

Verified

Option D

SELECT * FROM table_name;

Additional Explanation

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