Dive into the fourth part of a database design primer focusing on normalization in Oracle SQL. Learn about the crucial concepts of First Normal Form (1NF), Second Normal Form (2NF), and how to handle unlimited phone numbers. Explore partial dependencies and their impact on database structure, using examples like books and authors. Delve into transitive dependencies and understand their role in database normalization. This tutorial provides practical insights into creating efficient and well-structured databases, essential for anyone working with Oracle SQL or database design in general.