Learning PostgreSQL 11 - Third Edition

Data modeling

Data models describe real-world entities such as customer, service, products, and the relation between these entities. Data models provide an abstraction for the relations in the database. Data models aid the developers in modeling business requirements and translating business requirements to relations. They are also used for the exchange of information between the developers and business owners.

In the enterprise, data models play a very important role in achieving data consistency across interacting systems. For example, if an entity is not defined, or is poorly defined, then this will lead to inconsistent and misinterpreted data across the enterprise. For instance, if the semantics of the customer entity are not defined ...