........... normal form is based on the concept of transitive dependency.

Question

Accepted Answer

The correct option is (2):
The Third Normal Form (3NF) is specifically designed to eliminate transitive dependency, which is its defining characteristic in the database normalization process. A transitive dependency exists when a non-key attribute is functionally dependent on another non-key attribute, which, in turn, is functionally dependent on the primary key (e.g., A -\> B and B -\> C, therefore A -\> C is transitive). In a relational database, this type of indirect dependency leads to data redundancy, as information is unnecessarily repeated across multiple rows. The goal of achieving 3NF is to decompose the table into smaller, well-structured tables, ensuring that every non-key attribute depends only on the primary key, thus maximizing data integrity and preventing update, insertion, and deletion anomalies.

The incorrect option is (1):
The First Normal Form (1NF) is the most basic level of normalization and is primarily concerned with atomicity and the elimination of repeating groups. It requires that each cell in a table must contain a single, indivisible value, and that there are no multi-valued attributes. The concept of functional dependency, which is essential for identifying a transitive dependency, is not a direct concern of 1NF. A relation must first satisfy 1NF before you can even begin to check for the more complex dependencies addressed by 2NF and 3NF.

The incorrect option is (3):
The Second Normal Form (2NF) is based on the concept of eliminating *partial dependency*, not transitive dependency. Partial dependency is only a concern in tables with a *composite primary key* (a key made of two or more attributes). 2NF requires that every non-key attribute must be fully functionally dependent on the *entire* primary key. In contrast, 3NF is the one that builds upon 2NF to tackle the non-key-to-non-key functional relationship known as transitive dependency.

The incorrect option is (4):
The statement "All options are wrong" is incorrect because the Third Normal Form (3 NF) directly and formally relates to the concept of transitive dependency. Database normalization provides a systematic approach to minimizing data redundancy, and each normal form is explicitly defined by the type of dependency it aims to eliminate. Since 3NF's rule is the removal of transitive dependencies, this option is demonstrably false.