Data Model
Is a blue print of how data is stored in db and is similar to an architecture approach for how data is stored a pretty picture. Commonly known as an entry relationship diagram. Data model can be loosely used to describe an organized and ordered set of info. Stored on computer. This orderd set of data is often structured using a data modeling solution is such a way as to make the retrival of and change to that data more efficient. Depending on the type of application using db, the db structure can be modified to allow for efficient changes to that data.
there are three data model:
1- hierarichal Data Model
2- Network Data Model
3- Relational Data Model