Rule 1: The Information RuleRule 2: Guaranteed Access RuleRule 3: Systematic Treatment of NULL ValuesRule 4: Dynamic Online Catalog Based on the Relational ModelRule 5: Comprehensive Data Sublanguage RuleRule 6: View Updating RuleRule 7: High-Level Insert, Update, and DeleteRule 8: Physical Data IndependenceRule 9: Logical Data IndependenceRule 10: Integrity IndependenceRule 11: Distribution IndependenceRule 12: Non-Subversion RuleSummary