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Describe the nature of a database management system (DBMS). How did this lead to the concept of relational DBMS, and what are the distinguishing features

Describe the nature of a database management system (DBMS). How did this lead to the concept of relational DBMS, and what are the distinguishing features of a relational DBMS? How is SQL a part of this, and more recently, how and why has this also led to the concept of the NoSQL DBMS?

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