Modern SQL Servers are built on RDBMS.
DBMS - Database Management System
A Database Management System (DBMS) is a computer program that can access data in a database.
The DBMS program enables you to extract, modify, or store information in a database.
Different DBMS programs provides different functions for querying data, reporting data, and modifying data.
RDBMS - Relational Database Management System
A Relational Database Management System (RDBMS) is a Database Management System (DBMS) where the database is organized and accessed according to the relationships between data.
RDBMS was invented by IBM in the early 1970's.
RDBMS is the basis for SQL, and for all modern database systems like Oracle, SQL Server, IBM DB2, Sybase, MySQL, and Microsoft Access.
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