5.1 Brief History of SQL in Relational Database Systems
The relational model was first proposed by E. F. Codd in 1970. D. D. Chamberlin and others at the IBM San Jose Research Laboratory developed the language now called SQL, or Structured Query Language, as a data sublanguage for the relational model. Originally spelled SEQUEL, the language was described in a series of papers starting in 1974, and it was used in a prototype relational system called System R, which was developed by IBM in the late 1970s. Under the direction of Larry Ellison, Bob Miner, and Ed Oates, an early commercial relational database management system (RDBMS), Oracle, was developed in the late 1970s using SQL as its language. Ingres, another early prototype RDBMS, was developed ...
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