Relational Database Management System (RDBMS) Question:
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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.
► 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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