102. 3NF — example 3

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

What is the central dependency rule of 3NF?

Looking for the latest Sarkari Result 2026 updates? Check the latest government exam results, merit lists and result updates on Sarkari Resultess.

Answer & Explanation

4 Answers

Verified

Option A

All values must be duplicated.

Additional Explanation

This option is incorrect for the stated requirement.

Verified

Option B

Every table must have exactly one index.

Additional Explanation

This option is incorrect for the stated requirement.

Verified

Option C

Every table must have three columns.

Additional Explanation

This option is incorrect for the stated requirement.

Verified Correct Answer

Option D

Non-key attributes should not depend transitively on a candidate key, subject to the formal 3NF definition.

Additional Explanation

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