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A Brief History of SQL

Prior to the release of the first relational database management system each database had a unique physical structure
http://www.w3computing.com/sqlserver/brief-history-sql/

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In 1970, Dr. E. F. Codd published an article that described the relational database model he had been working on with a research team at IBM. By 1978, the IBM team had developed a database system based on this model, called System/R, along with a query language called SEQUEL

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