Understanding Transitive Dependency in Databases
What is the best definition of a transitive dependency?
a. a condition in which an attribute is independent of another attribute that is not part of the primary key.
b. a condition in which an attribute is dependent on another attribute that is part of the primary key.
c. a condition in which an attribute is independent of another attribute that is part of the primary key.
Answer:
A transitive dependency refers to a condition in which an attribute is dependent on another attribute that is not part of the primary key. This means that if A depends on B, and B depends on C, then A indirectly depends on C.
Understanding Transitive Dependency in Databases
Transitive Dependency in Databases:
In the context of databases, transitive dependency is a concept that describes the relationship between attributes within a table. It occurs when an attribute is dependent on another attribute, which is not part of the primary key. This dependency creates a chain of relationships where an attribute indirectly depends on another through intermediary attributes.
Example:
Let's consider a database table with attributes such as employee ID, employee name, department ID, and department name. In this case, the department ID serves as the primary key. If we introduce a new attribute, department name, which depends on the department ID, and the department ID depends on the employee ID, we have a transitive dependency. The department name indirectly depends on the employee ID through the department ID.
Implications:
Understanding transitive dependency is crucial in database design as it can lead to data anomalies and inefficiencies. It violates the normalization process and can result in redundant data storage and maintenance issues. By identifying and resolving transitive dependencies, database designers can optimize the database structure and improve data integrity.
Conclusion:
A transitive dependency is best defined as a condition in which an attribute depends on another attribute that is not part of the primary key. Recognizing and addressing transitive dependencies is essential for maintaining a well-structured and efficient database system.