Relational Databases
Relational Database:
A database system in which the database is organized and accessed according to the relationships between data items without the need for any consideration of physical orientation and relationship. Relationships between data items are expressed by means of tables.
From: www.orafaq.com/glossary/faqglosr.htm
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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