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http://en.wikipedia.org/wiki/Tuple_Relational_Calculus
Tuple calculus is a calculus that was introduced by Edgar F. Codd as part of the relational model, in order to provide a declarative database-query language for this data model. It formed the inspiration for the database-query languages QUEL and SQL, of which the latter, although far less faithful to the original relational model and calculus, is ...
Found on
http://en.wikipedia.org/wiki/Tuple_relational_calculus
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