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The Nested Universal Relation Database Model (Paperback, 1992 ed.)
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The Nested Universal Relation Database Model (Paperback, 1992 ed.)
Series: Lecture Notes in Computer Science, 595
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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.
General
Imprint: |
Springer-Verlag
|
Country of origin: |
Germany |
Series: |
Lecture Notes in Computer Science, 595 |
Release date: |
May 1992 |
First published: |
1992 |
Authors: |
Mark Levene
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Dimensions: |
235 x 155 x 10mm (L x W x T) |
Format: |
Paperback
|
Pages: |
182 |
Edition: |
1992 ed. |
ISBN-13: |
978-3-540-55493-6 |
Categories: |
Books >
Computing & IT >
Applications of computing >
Databases >
General
|
LSN: |
3-540-55493-9 |
Barcode: |
9783540554936 |
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