Computer Science Studies (BIT)

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 DAta Base Questions Answers

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PostSubject: DAta Base Questions Answers   DAta Base Questions Answers EmptyTue Jul 15, 2014 6:34 pm

Q1:-Describe the three levels of data abstraction?
Ans:- The are three levels of abstraction:
1.Physical level:The lowest level of abstraction describes how data are stored.
2.Logical level:The next higher level of abstraction, describes what data are stored in database and what relationship among those data.
3.View level:The highest level of abstraction describes only part of entire database.
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