Inclusion dependencies and their interaction with functional dependencies in SQL
نویسندگان
چکیده
منابع مشابه
Guaranteeing no interaction between functional dependencies and tree-like inclusion dependencies
Functional dependencies (FDs) and inclusion dependencies (INDs) are the most fundamental integrity constraints that arise in practice in relational databases. A given set of FDs does not interact with a given set of INDs if logical implication of any FD can be determined solely by the given set of FDs, and logical implication of any IND can be determined solely by the given set of INDs. The set...
متن کاملHow to Prevent Interaction of Functional and Inclusion Dependencies
Functional dependencies (FDs) and inclusion dependencies (INDs) are the most fundamental integrity constraints that arise in practice in relational databases. A given set of FDs does not interact with a given set of INDs if logical implication of any FD can be determined solely by the given set of FDs, and logical implication of any IND can be determined solely by the given set of INDs. We exhi...
متن کاملArmstrong Databases for Functional and Inclusion Dependencies
An Armstrong database is a database that obeys precisely a given set of sentences (and their logical consequences) and no other sentences of a given type. It is shown that if the sentences of interest are inclusion dependencies and standard functional dependencies (functional dependencies for which the left-hand side is nonempty), then there is always an Armstrong database for each set of sente...
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The implication problem for the class of embedded dependencies is undecidable. However, this does not imply lackness of a proof procedure as exemplified by the chase algorithm. In this paper we present a complete axiomatization of embedded dependencies that is based on the chase and uses inclusion dependencies and implicit existential quantification in the intermediate steps of deductions.
متن کاملDesign by Example for SQL Tables with Functional Dependencies
An Armstrong relation satisfies the functional dependencies (FD) implied by a given FD set and violates all other FDs. Therefore, they form an instance of the design-by-example methodology: the example relation exhibits precisely those FDs that the current design perceives as meaningful for the application domain. The existing framework of Armstrong relations only applies to total relations. We...
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ژورنال
عنوان ژورنال: Journal of Computer and System Sciences
سال: 2017
ISSN: 0022-0000
DOI: 10.1016/j.jcss.2016.11.004