Multivalued Dependencies With Null Values In Relational Data Bases

@article{Lien1979MultivaluedDW,
  title={Multivalued Dependencies With Null Values In Relational Data Bases},
  author={Y. Edmund Lien},
  journal={Fifth International Conference on Very Large Data Bases, 1979.},
  year={1979},
  pages={61-66}
}
  • Y. Edmund Lien
  • Published 1979 in
    Fifth International Conference on Very Large Data…
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… CONTINUE READING
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