Question

which of the following is a key criterion of second normal form? a.) it must contain functional dependencies. b.) it must already be in 3nf. c.) it must have repeating groups. d.) it must already be in 1nf.

Answer 1

Second Normal Form (2NF) requires a table to eliminate partial dependencies by ensuring that it contains functional dependencies, promoting a more organized and efficient relational database structure. (option A)

Second Normal Form (2NF) is a database normalization criterion that mandates a table to eliminate partial dependencies. It necessitates that all non-key attributes be fully functionally dependent on the primary key, eliminating redundancy and ensuring data integrity. Unlike 3NF, 2NF does not require the absence of transitive dependencies.

Instead, it focuses on addressing partial dependencies, ensuring that each non-key attribute relies entirely on the entire primary key for its uniqueness. By meeting this criterion, a database design adheres to the principles of 2NF, fostering a more organized and efficient relational database structure, ultimately reducing data anomalies and enhancing the reliability of the stored information. The correct option is A.