C.J.Date, one of the creators of the relational database model, and a team lead on the original DB2, created this 900 word dictionary of relational database terms as a handy reference. The reason for the book is that over half the terms are common English, like "data definition, join, attribute, predicate, index, cube, key, DDS, table…" and when they are defined, even worse, the definitions are imprecise. It is a chore to find their true relational database meaning online. A version of the book with 586 definitions was published by O’Reilly and feedback from that book, along with numerous updates, led to this 900 word book.

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C. J. Date is an independent author, lecturer, researcher, and consultant, specializing in relational database technology, a field he helped pioneer. He is best known for his book, An Introduction to Database Systems (8th edition, 2004), which has sold over 750,000 copies and is used by several hundred colleges and universities worldwide. He is also author of many other books on relational database management, including Logic and Databases: The Roots of Relational Theory (2007). He was inducted into the Computing Industry Hall of Fame in 2004.

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