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What are Data Models?
Data models can be defined as how the logical structure of a database is modeled or formed. Data models describe how data is linked to each other and how they are processed and stored and saved inside the system.

The very first data model created could be flat data-models, whereby all the data used are to be kept in the same plane. 

In the early days, data models were not so scientific, therefore tends to set up lots of duplication and update abnormalities.

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