Levels of data abstraction
Illustrates the levels of data abstraction?
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Three levels of abstraction are defined here as follows::
Physical level:
It is the lowest level of abstraction explains how data are stored.
Logical level:
It is the next higher level of abstraction, explains what data are stored inside database and what connections among such data.
View level:
It is the highest level of abstraction explains only part of whole database.
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