Database Model
A Database model defines the logical design of data. The model describes the relationships between different parts of the data. Historically, in database design, three models are commonly used. They are,
- Hierarchical Model
- Network Model
- Relational Model
Hierarchical Model
In this model each entity has only one parent but can have several children . At the top of hierarchy there is only one entity which is called Root.
Network Model
In the network model, entities are organised in a graph,in which some entities can be accessed through several path
Relational Model
In this model, data is organised in two-dimesional tables called relations. The tables or relation are related to each other.
No comments:
Post a Comment