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- These models provide a flexible data structuring capabilities.
- Community view : the logical structure of the entire database
- Contains ‘What’ data is stored •
- Shows relationships among data
- constraints
- semantic information (business rules – discussed later)
- security & integrity information
- A database is considered as a collection of entities (objects) of various kinds.
- Basis for identification and high-level description of main data objects, avoids details
- They are database independent. It does not matter what database you will be using.
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