What aspect of database normalization does the Third Normal Form (3NF) require?

What aspect of database normalization does the Third Normal Form (3NF) require?

• A. All attributes must depend on the primary key
• B. No non-key attributes can depend on other non-key attributes
• C. All tables must have at least two primary keys
• D. Data must only be stored in a raw format

Answer: (B)

The requirement of the Third Normal Form (3NF) in database normalization is that no non-key attributes can depend on other non-key attributes. This principle ensures that all attributes in a table are functionally dependent only on the primary key and not on any other non-key attribute, which helps to eliminate transitive dependencies. By adhering to this rule, 3NF promotes data integrity and reduces redundancy within the database. Ensuring that non-key attributes rely solely on the primary key avoids situations where changes to one non-key attribute could inadvertently affect others, thus enhancing the stability and accuracy of data management. This normalization level serves as a critical step in designing databases efficiently, allowing for more effective data organization and maintenance.

The requirement of the Third Normal Form (3NF) in database normalization is that no non-key attributes can depend on other non-key attributes. This principle ensures that all attributes in a table are functionally dependent only on the primary key and not on any other non-key attribute, which helps to eliminate transitive dependencies.

By adhering to this rule, 3NF promotes data integrity and reduces redundancy within the database. Ensuring that non-key attributes rely solely on the primary key avoids situations where changes to one non-key attribute could inadvertently affect others, thus enhancing the stability and accuracy of data management.

This normalization level serves as a critical step in designing databases efficiently, allowing for more effective data organization and maintenance.