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== Relational Algebra == [http://en.wikipedia.org/wiki/Relational_algebra Relational algebra] on Wikipedia A commercially failed relational algebra database called [http://en.wikipedia.org/wiki/Business_System_12 Business System 12] on Wikipedia [http://en.wikipedia.org/wiki/Rel_%28DBMS%29 Rel] an open source relational database management system primarily used in teaching. [http://db.grussell.org/section010.html Relational Algebra] portion of a [http://db.grussell.org/index.html database eLearning site].
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