In 1968 era Dr.E.F.Codd a relational model is proposed, which is based on the principle of a mathematical model to solve problems of the original database. After that, the company, IBM has introduced the concept of Dr. F. E. Codd. To create a relational database system called the system R and d as DB system, there are currently 2 database software manufacturers become. Using the hypothesis of Dr.E.F.Codd to create a relational database systems like Microsoft Access, Microsoft SQL Server, Oracle, My SQL, etc.
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