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Databases Illuminated, 4th Edition
book

Databases Illuminated, 4th Edition

by Catherine M. Ricardo, Susan D. Urban, Karen C. Davis
March 2022
Intermediate to advanced content levelIntermediate to advanced
682 pages
22h 58m
English
Jones & Bartlett Learning
Content preview from Databases Illuminated, 4th Edition

2.7 Overview of Data Models

A data model provides a description of the database structure, including the data, the relationships, constraints, and sometimes data semantics or meanings and operations that can be performed. It uses a collection of tools, often including a type of diagram and specialized vocabulary for describing the structure of the database. There is much disagreement over what constitutes a data model, and that is reflected in the dozens of proposed models and methodologies found in the literature.

2.7.1 The Entity-Relationship (ER) Model

The entity-relationship (ER) model is an example of a semantic model. Semantic models are used to describe the conceptual level of data, and are independent of the logical, internal, and physical ...

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Publisher Resources

ISBN: 9781284231595