Describe the three levels of data abstraction?

Describe the three levels of data abstraction?
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Answer :

There are three levels of abstraction:
∙ Physical level: The lowest level of abstraction describes how data are stored. ∙ Logical level: The next higher level of abstraction, describes what data are stored in  database and what relationship among those data.
∙ View level: The highest level of abstraction describes only part of entire database.
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