Information Technology

Gartner Glossary

Codd’s Rule Zero

Ted Codd, whose theoretical work on relational databases stimulated today’s plethora of relational products, defined a fundamental “Rule Zero” for classifying relational database management systems (RDBMSs). The intent of this rule was to help enterprises focus on the requirement for a consistent integrity layer in the RDBMSs they evaluated: “For any system that is advertised as, or claimed to be, a relational database management system, that system must be able to manage databases entirely through its relational capabilities, no matter what additional capabilities the system may support.”

Experience Gartner conferences

Master your role, transform your business and tap into an unsurpassed peer network through our world-leading virtual and in-person conferences.

Gartner Webinars

Expert insights and strategies to address your priorities and solve your most pressing challenges.