Many relational database systems are equipped with the option of using SQL (Structured Query Language) for querying and updating the database.

History

The concept of relational database was defined by E. F. Codd at IBM in 1970. Codd introduced the term relational in his research paper "A Relational Model of Data for Large Shared Data Banks". In this paper and later papers, he defined what he meant by relation. One well-known definition

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