SQL The Complete Reference by James R.Groff & Paul N.Weinberg
The SQL language and relational database systems based on it are one of the most important foundation technologies in the computer industry today. Over the last decade, the popularity of SQL has exploded, and it stands today as the standard computer database language. Literally hundreds of database products now support SQL, running on computer systems from mainframes to personal computers and even handheld devices. An official international SQL standard has been adopted and expanded twice.Virtually every major enterprise software product relies on SQL for its data management, and SQL is at the core of the database products from Microsoft and Oracle, two of the largest software companies in the world. From its obscure beginnings as an IBM research project, SQL has leaped to prominence as both an important computer technology and a powerful market force.
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