Fulminate 发表于 2025-3-28 17:59:49
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Gustav Doetsch applicable but its value is arbitrary. We adopt the view that tuples denote statements of predicate logic about database relations. Then, a null value of the first kind, respectively second kind, corresponds to an existentially quantified variable, respectively universally quantified variable. ForDetoxification 发表于 2025-3-29 00:36:02
Gustav Doetschse notions are equivalent in the case that all constraints in the database are functional dependencies. This result solves an open problem of Rissanen. However, for arbitrary constraints the notions are shown to differ.Vulnerable 发表于 2025-3-29 06:55:40
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Gustav Doetsches. A few additional useful rules are derived. It is shown that various formal systems for subfamilies of the family of join dependencies can be derived from our system. Special attention is paid to the case where the dependencies are total. For this case it is shown that our rules derive the comple完成才能战胜 发表于 2025-3-29 16:30:09
Gustav Doetscha workshop in Toulouse, France. The first workshop, held in 1977 focused primarily on the important topic of logic and databases. The book, Logic and Databases was the result of this effort. The diverse uses of logic for databases such as its use as a theoretical basis for databases, for deduction aManifest 发表于 2025-3-29 23:40:55
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