C++ Program

Data models are a collection of conceptual tools for describing data, data relationships, data semantics and data constraints. There are three different groups : (i) Object-Based Logical Models. (ii) Record-Based Logical Models. (iii) Physical Data Models. We'll look at them in more detail now : (i) Object-Based Logical Models : Describe data at the conceptual and view levels. Provide fairly flexible structuring capabilities. Allow one to specify data constraints explicitly. Over 30 such models, including : a) Entity-Relationship Model b) Object-Oriented Model c) Binary Model d) Semantic Data Model e) Info Logical Model f) Functional Data Model