133. many-to-many — scenario 2

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

How should a many-to-many student-course relationship be implemented relationally?

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Answer & Explanation

4 Answers

Verified Correct Answer

Option A

Use a junction table such as enrollments(student_id, course_id) with foreign keys to both parent tables.

Additional Explanation

Correct implementation. Prefer parameterized queries in application code, validate affected rows for UPDATE/DELETE, and use transactions for related writes.

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Option B

Put all student IDs in one course text field.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

Duplicate the student table for every course.

Additional Explanation

This option is incorrect for the stated requirement.

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Option D

Use no keys.

Additional Explanation

This option is incorrect for the stated requirement.