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- W2162715748 abstract "The role of null values in a relational data base is considered within the framework of multivalued dependencies. When a relation contains null values, a different treatment of data dependencies and different relational operations such as projection and join, are necessary. This paper develops a complete axiomatization for the revised multivalued dependencies. In particular, complementation, reflexivity, augmentation, and union are shown to be a complete set of inference rules. In contrast with the conventional multivalued dependencies, the transitivity rule cannot be used. These results provide a framework for the use of the revised multivalued dependencies in choosing relations and their attributes for a feasible data-base design." @default.
- W2162715748 created "2016-06-24" @default.
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- W2162715748 date "2005-08-25" @default.
- W2162715748 modified "2023-09-27" @default.
- W2162715748 title "Multivalued Dependencies With Null Values In Relational Data Bases" @default.
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- W2162715748 doi "https://doi.org/10.1109/vldb.1979.718119" @default.
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