Codd's rules (Edgar F. Codd)

Codd's rules are a set of foundational principles designed to ensure databases are structured and operate consistently as relational databases. They stipulate that data should be stored in tables with clear relationships, accessible through standardized methods, and independent of applications, allowing data to be easily retrieved, manipulated, and maintained without unintended effects. These rules aim to guarantee data integrity, uniformity, and flexibility, ensuring that databases are reliable, understandable, and capable of supporting complex queries and updates in a controlled, predictable manner.