3511. Attendance: Find students with attendance below 75%. — Transactions

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

In a attendance module, solve this as a production problem using Transactions: Find students with attendance below 75%. 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

DELETE FROM table_name;

Additional Explanation

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

Verified

Option B

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 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 student_id,100*SUM(status='present')/COUNT(*) attendance_pct FROM attendance GROUP BY student_id HAVING attendance_pct<75;

Additional Explanation

The calculation assumes each attendance row represents one expected attendance event.