Topic: Database Management Systems
Fifth Normal form is concerned with
- A. Join dependency
- B. Domain-key
- C. Multivalued dependency
- D. Functional dependency
Answer: A. Join dependency
Explanation: Fifth Normal Form (5NF), also known as Project-Join Normal Form (PJNF), specifically addresses and eliminates redundancy related to join dependencies. It ensures that a relation cannot be losslessly decomposed into smaller tables unless those tables represent candidate keys.