The Nested Universal Relation Database Model

ISBN-13: 9783540554936 / Angielski / Miękka / 1992 / 192 str.

M. Levene; Mark Levene

Opis

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.

Spis treści

The underlying database models.- The null extended nested relational model.- Null extended data dependencies and the extended chase.- A universal relation model for a nested database.- A universal relation model for a single nested relation.- Concluding remarks and ongoing research.