E.F.CODD RULES

E.F.CODD RULES

0. FUNDAMENDAL RULE

1. INFORMATION RULE

2. GUARANTEED ACCESS RULE

3. SYSTEMATIC TREATMENT OF NULL VALUES

4. DYNAMIC ON-LINE CATALOG BASED ON RELATIONAL MODEL

5. COMPREHENSIVE DATA SUBLANGUAGE RULE

6. VIEW UPDATING RULE

7. HIGH LEVEL INSERT, UPDATE, AND DELETE

8. PHYSICAL DATA INDEPENDENCE

9. LOGICAL DATA INDEPENDENCE

10. INTEGRITY INDEPENDENCE

11. DISTRIBUTED INDEPENDENCE

12.NON-SUB VERSION RULE