Deductive Databases
Deductive Database:
A deductive database system is a database system which can make deductions (ie: infer additional rules or facts) based on rules and facts stored in the (deductive) database.Deductive database systems:* Mainly deal with rules and facts.* Use a declarative language (such as prolog) to specify those rules and facts.* Use an inference engine which can deduce new facts and rules from those given.
From:en.wikipedia.org/wiki/Deductive_database
DES
The Datalog Educational System (DES) is a free Prolog-based implementation of a basic deductive database with stratified negation which uses Datalog as a query language. The system is implemented on top of Prolog and you can use it from a Prolog interpreter running both on Windows and Unix/Linux. Moreover, Windows, Linux and Unix executables are also provided.
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DES
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