What are the three levels of data abstraction?

 Posted by Abhisek on 1/21/2010 | Category: Sql Server Interview questions | Views: 8564

The are three levels of abstraction are as follows:

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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