Every database includes tables, and constraints can't be referred to as a rational database system. When any database has only relational data model, it can't be a Relational Database System (RDBMS). So, some rules specify a database to function as appropriate RDBMS.
These principles were developed by Dr. Edgar F. Codd (E.F. Codd) at 1985, who has vast research knowledge on the Relational Model of Database Systems. Codd presents his 13 principles to get a database to test the idea of DBMS contrary to his inaugural model, and when a database follows the principle, it's referred to as a true relational database (RDBMS).
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