Titlebook: Deductive and Object-Oriented Databases; Second International C. Delobel,M. Kifer,Y. Masunaga Conference proceedings 1991 Springer-Verlag B

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VERT

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Dennis Walkenhorst,Maximilian Rufin this framework, we consider a class of “single pass-evaluable” selection operations. We show how such selection operations can be succinctly expressed by programs that use only very simple positive existential selections. Also, a syntactic criterion is developed for the . of two such positive exi

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Olivia Wallis BA(Hons),Emily Livorsi PhD dependencies) are defined. First, a formalization of a model-theoretic semantics of updates is provided: the notions of . and . are introduced to characterize the various cases. Then, a proof-theoretic approach, based on a variant of resolution integrated with the chase procedure, is defined, showi

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SEMI

https://doi.org/10.1007/978-3-658-17574-0fine complex object types in which property values may be any other objects. Often the query language allows a user to navigate from object to object by following a property value path. In this paper, we consider the combination of three forms of constraints over complex object types: equations, fun