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- catalog abstract ""This monograph describes a method of data modelling whose basic aim is to make databases easier to use by providing them with logical data independence. To achieve this, the nested UR (universal relation) model is defined by extending the classical UR model to nested relations. Nested relations generalize flat relations and allow hierarchically structured objects to be modelled directly, whereas the classical UR model allows the user to view the database as if it were composed of a single flat relation. The author presents a comprehensive formalisation of the nested relational model, which incorporated null values into the model. Functional data dependencies and the classical notion of lossless decomposition are extended to nested relations and an extended chase procedure is defined to test the satisfaction of the data dependencies. The nested UR model is defined, and the classical UR model is shown to be a special case of the nested model. This implies that an UR interface canbe implemented by using the nested UR model, thus gaining the full advantages of nested relations over flat relations."--PUBLISHER'S WEBSITE.".
- catalog contributor b3872004.
- catalog created "c1992.".
- catalog date "1992".
- catalog date "c1992.".
- catalog dateCopyrighted "c1992.".
- catalog description ""This monograph describes a method of data modelling whose basic aim is to make databases easier to use by providing them with logical data independence. To achieve this, the nested UR (universal relation) model is defined by extending the classical UR model to nested relations. Nested relations generalize flat relations and allow hierarchically structured objects to be modelled directly, whereas the classical UR model allows the user to view the database as if it were composed of a single flat relation. The author presents a comprehensive formalisation of the nested relational model, which incorporated null values into the model. Functional data dependencies and the classical notion of lossless decomposition are extended to nested relations and an extended chase procedure is defined to test the satisfaction of the data dependencies. The nested UR model is defined, and the classical UR model is shown to be a special case of the nested model. This implies that an UR interface canbe implemented by using the nested UR model, thus gaining the full advantages of nested relations over flat relations."--PUBLISHER'S WEBSITE.".
- catalog description "Includes bibliographical references (p. ) and index.".
- catalog description "Revision of the author's thesis (Ph. D.)--Birkbeck College, 1990.".
- catalog extent "177 p. ;".
- catalog hasFormat "Nested universal relation database model.".
- catalog identifier "0387554939 (Springer-Verlag New York Berlin Heidelberg : acid-free paper)".
- catalog identifier "3540554939 (Springer-Verlag Berlin Heidelberg New York : acid-free paper)".
- catalog isFormatOf "Nested universal relation database model.".
- catalog isPartOf "Lecture notes in computer science ; 595".
- catalog issued "1992".
- catalog issued "c1992.".
- catalog language "eng".
- catalog publisher "Berlin ; New York : Springer-Verlag,".
- catalog relation "Nested universal relation database model.".
- catalog subject "005.75/6 20".
- catalog subject "Database design.".
- catalog subject "QA76.9.D3 L48 1992".
- catalog subject "Relational databases.".
- catalog title "The nested universal relation database model / M. Levene.".
- catalog type "text".