88. partial dependency — example 1

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

What is a partial dependency?

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Answer & Explanation

4 Answers

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Option A

A dependency on no columns.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option B

A non-key attribute depends on only part of a composite candidate key rather than the whole key.

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 C

A foreign key with CASCADE.

Additional Explanation

This option is incorrect for the stated requirement.

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Option D

A dependency created only by an index.

Additional Explanation

This option is incorrect for the stated requirement.