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A relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd

· The database which meets the following 12 codd rules are called as RDBMS



1. The system must qualify as relational, as a database & as a management system.

2. The information rule.

3. The guaranteed access rule.

4. Systematic treatment of null values.

5. Active online catalog based on the relational model.

6. The comprehensive data sublanguage rule.

7. The view updating rule.

8. High-level insert, update, and delete.

9. Physical data independence.

10. Logical data independence.

11. Integrity independence.

12. Distribution independence.

13. The non subversion rule