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Safety and Translation of Relational Calculus Queries false
By:Allen Van Gelder
Published on 1989 by

Abstract: |Not all queries in relational calculus can be answered sensibly when disjunction, negation, and universal quantification are allowed. The class of relational calculus queries, or formulas, that have sensible answers is called the domain independent class, which is known to be undecidable. Subsequent research has focused on identifying large decidable subclasses of domain independent formulas. In this paper we investigate the properties of two such classes: the evaluable formulas and the allowed formulas. Although both classes have been defined before, we give simplified definitions, present short proofs of their main properties, and describe a method to incorporate inequalities.

This Book was ranked at 35 by Google Books for keyword Relational Databases.

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