DATA MODELS
DATA MODELS In Short -- Data models are the collection of conceptual tools for describing data, relationships, data semantics and data constraints. Categories of Data Models : *High Level/Conceptual Level -- Provide concepts that are close to the way many users perceive data. For example : Entity Relationship Model. *Low Level/Physical Level -- Provide concepts that describe the details of how data is stored in the computer. *Representational/Implementation Data Model -- Provide concepts that may be understood by the end users but that are not too for removed from the way data is organized with the computer. For example : Network and Hierarchical.