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SQL has much to do with a researcher at IBM, Edgar F. (Ted) Codd, an Oxford-trained mathematician, who researched what was termed "the relational model" for data representation.

SQL, the standard that was later developed from Codd's work, provides a means of describing data with its natural structure only - that is, without superimposing any additional structure for machine representation purposes.

This means that SQL provides data independence from hardware and storage implementation, together with a high level, nonprocedural language for accessing and querying data.

Reference: http://www.nap.edu/readingroom/books/far/ch6.html

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