2556. Education: Find students who scored above their class average. — Laravel Eloquent

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In a education module, solve this as a production problem using Laravel Eloquent: 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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Questions & Answers

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.
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Editorial Answer 1
Verified

Option B

DELETE FROM table_name;
Additional Explanation
Incorrect: it does not satisfy the stated business rule and can return/change unintended data.
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Editorial Answer 2
Verified

Option C

SELECT * FROM table_name;
Additional Explanation
Incorrect: it does not satisfy the stated business rule and can return/change unintended data.
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Editorial Answer 3
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.
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Editorial Answer 4