Learn about database design fundamentals in Oracle SQL, focusing on relationships, primary keys, and foreign keys. Explore entity-attribute relationships, one-to-one, one-to-many, and many-to-many relationships, and understand how to implement them using primary and foreign keys. Gain practical knowledge on identifying entities, attributes, and designing basic database structures. This tutorial provides essential insights for beginners and intermediate learners looking to strengthen their understanding of relational database concepts and their implementation in Oracle SQL.