Data Models

1. Data models are a collection of conceptual tools for describing data, data relationships, data semantics and data constraints. There are three different groups:
   1. Object-based Logical Models.
   2. Record-based Logical Models.
   3. Physical Data Models.
   We'll look at them in more detail now.

• Object-based Logical Models
  • The E-R Model
  • The Object-Oriented Model
• Record-based Logical Models
  • The Relational Model
  • The Network Model
  • The Hierarchical Model
• Physical Data Models