Codd's Theorem

Codd's theorem, formulated by Edgar F. Codd, is a fundamental principle in database theory. It asserts that a relational database can be fully described using a set of rules, known as the relational model. This means that all data relationships can be represented through tables and that data retrieval should only involve simple operations like selecting, projecting, and joining tables. Essentially, Codd's theorem underscores the importance of data independence and the structured way databases store information, ensuring that users can access and manipulate data without needing to understand the underlying complexities of the system.