Codd's Twelve Rules

Codd's Twelve Rules are a set of criteria proposed by Edgar F. Codd to define what qualifies as a true relational database. They emphasize data independence, consistency, and integrity. Key rules include: data should be stored in tables, all data should be accessible through a common language (SQL), and changes to the database's structure shouldn’t affect how data can be accessed. This ensures reliable, flexible, and efficient data management, making systems easier to design and use while supporting accurate data retrieval and security. Overall, they establish a foundation for effective relational database systems.