124. one-to-one — scenario 1

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

How can a one-to-one relationship be enforced?

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Answer & Explanation

4 Answers

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Option A

Use GROUP BY only.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

Use CROSS JOIN.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

Use a non-unique foreign key only.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

Use a foreign key with a UNIQUE constraint on the referencing column, or merge the tables when appropriate.

Additional Explanation

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