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Codd's model is now accepted as the definitive model for relational database management systems (RDBMS).
The language, Structured English Query Language (SEQUEL) was developed by IBM Corporation, Inc., to use Codd's model.
SEQUEL later became SQL (still pronounced "sequel").
In 1979, Relational Software, Inc. (now Oracle) introduced the first commercially available implementation of SQL.
Today, SQL is accepted as the standard RDBMS language.
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Anyway thanks a lot...
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Article based on "History of SQL":
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