A Data Model is a logical structure of Database. It describes the design of database to reflect entities, attributes, relationship among data, constrains etc.
Types of Data Models:
Object based logical Models – Describe data at the conceptual and view levels.
- E-R Model
- Object oriented Model
Record based logical Models – Like Object based model, they also describe data at the conceptual and view levels. These models specify logical structure of database with records, fields and attributes.
- Relational Model
- Hierarchical Model
- Network Model – Network Model is same as hierarchical model except that it has graph-like structure rather than a tree-based structure. Unlike hierarchical model, this model allows each record to have more than one parent record.
Physical Data Models – These models describe data at the lowest level of abstraction.
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