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- W2138865807 abstract "Multivalued dependencies (MVD) and join dependencies were introduced to study database design problems. Join dependencies can be divided into cyclic and acyclic join dependencies. A fundamental result in dependency theory is that a join dependency is acyclic if and only if it is equivalent to a set of MVDs. In addition to this characterization it has been shown that such a set of MVDs has a cover which is a conflict-free MVD set. Although this result gives considerable insight into the “syntactic” structure of a set of MVDs equivalent to an acyclic join dependency, the definition of a conflict-free MVD set is complex and does not provide insight into what is meant by the “semantic” notion of a set of MVDs free of conflicts. We introduce the concept of an interaction-free MVD set. In contrast to the definition of a conflict-free MVD set, the definition of an interaction-free MVD set clearly indicates that we are dealing with a set of MVDs which do not interact in an adverse way. Furthermore, we provide a simple syntactic characterization of an interaction-free MVD set and show that a join dependency is acyclic if and only if it is equivalent to an interaction-free MVD set." @default.
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- W2138865807 date "1986-12-01" @default.
- W2138865807 modified "2023-09-26" @default.
- W2138865807 title "Interaction-free multivalued dependency sets" @default.
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- W2138865807 doi "https://doi.org/10.1016/0304-3975(86)90016-2" @default.
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