Question-5 Codd's theorem states that relational algebra and the domain-independent relational calculus queries, two well-known foundational query languages for the relational model, are precisely equivalent in expressive power. The article emphasizes organizational needs to adopt DBMS"...organization. It will be rather more surprising to see a company not using DBMS in this age". However, for a database to be regarded as a true relational database system, it is essential to conform to set of rules/commandments to improve data integrity, consistency, and usability. Present the rules/amendments for a true relational database system.
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