49. super key

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

What is a super key?

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Answer & Explanation

4 Answers

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Option A

A column that is always nullable.

Additional Explanation

This option is incorrect for the stated requirement.

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Option B

Only the primary key.

Additional Explanation

This option is incorrect for the stated requirement.

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Option C

Only a foreign key.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

A super key is any set of attributes that uniquely identifies a row; it may contain extra attributes beyond a minimal candidate key.

Additional Explanation

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