August 2009
Intermediate to advanced
893 pages
26h 48m
English
Content preview from Database Systems: Concepts, Design and Applications
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6.2. Basic E-R Concepts
E-R modelling is a high-level conceptual data model developed to facilitate database design. A conceptual data model is a set of concepts that describe the structure of a database and the associated retrieval and update transactions on the database. It is independent of any particular database management system (DBMS) and hardware platform. E-R model is also defined as a logical representation of data for an enterprise. It was developed to facilitate database design by allowing specification of an enterprise schema, which represents the overall logical structure of a database. It is a top-down approach to database design. It is an approximate description of the data, constructed through a very subjective evaluation of ...
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