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Erschienen in:
1987 | OriginalPaper | Buchkapitel
Deductive Databases
verfasst von : John Wylie Lloyd
Erschienen in: Foundations of Logic Programming
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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This chapter provides a theoretical basis for deductive database systems. A deductive database consists of a finite number of database statements, which have the form A←W, where A is an atom and W is a typed first order formula. A query has the form ←W, where W is a typed first order formula. An integrity constraint is a closed, typed first order formula. Function symbols are allowed to appear in formulas. Such a deductive database system can be implemented using a PROLOG system. The main results of this chapter are the soundness and completeness of the query evaluation process, the soundness of the implementation of integrity constraints, and a simplification theorem for implementing integrity constraints.