Great News!
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
In a relational database, which normalization form requires the removal of attributes in a table that are not dependent on the primary key?
The Correct Answer is: C. Third Normal Form (3NF)
Third Normal Form (3NF) requires that all attributes in a table be directly dependent on the primary key and not on any other non-key attributes. In other words, 3NF eliminates transitive dependencies, where a non-key attribute depends on another non-key attribute rather than directly on the primary key. This ensures that every piece of data in the table is related only to the primary key, improving data integrity and reducing redundancy.
Why the other options are incorrect:
A. First Normal Form (1NF)
1NF requires that the table has atomic (indivisible) values and that there are no repeating groups or arrays. It does not address dependency on the primary key.
B. Second Normal Form (2NF)
2NF builds on 1NF by removing partial dependencies, meaning all non-key attributes must depend on the whole primary key (important in tables with composite keys). It doesn’t remove transitive dependencies, which 3NF addresses.
D. Boyce-Codd Normal Form (BCNF)
BCNF is a stricter version of 3NF that deals with certain types of anomalies that 3NF does not cover, particularly when multiple candidate keys exist. It goes beyond removing attributes not dependent on the primary key but is more specialized.
Discover a range of courses designed to provide you with the knowledge and skills needed to excel in your chosen field.
You don’t need one month to study and pass your test.
With Prepsaret, it takes you a few days to grasp all the concepts needed to pass your exams