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65. Describe the three levels of data abstraction?
Answer:
The 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
Asked In :: Virtusa
The 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
* 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
