January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Data model perspectives
Data model perspectives are defined by ANSI as follows:
- Conceptual data model: Describes the domain semantics, and is used to communicate the main business rules, actors, and concepts. It describes the business requirements at a high level and is often called a high-level data model.
- Logical data model: Describes the semantics for a certain technology, for example, the UML class diagram for object-oriented languages.
- Physical data model: Describes how data is actually stored and manipulated at the hardware level, such as storage area network, table space, CPUs, and so on.
According to ANSI, this abstraction allows changing one part of the three perspectives without amending the other parts. One could change both ...
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