Codd's 12 Rules

Codd’s 12 Rules define what makes a database truly "relational," meaning it stores data in structured tables with clear relationships. They emphasize that data should be accessible through logical, consistent methods, support data integrity, and be independent of applications. The rules promote the use of a standard language (SQL), prevent data redundancy, and ensure the database can evolve without losing information or functionality. In essence, these rules establish a framework for designing reliable, flexible, and consistent databases that users can understand and work with efficiently.