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Describe the three levels of data abstraction?
Answer:
Physical Level - This is the lowest level of data abstraction which describes which describes how the data is to be stored in the database.
Logical level - The level describes the data in the database as well as relations between these database.
View Level- This is the highest level of data abstraction , only some part of actual database is viewed to the user.
Asked In ::
Manorma
23 Feb, 2019 5:07 AM
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 the database and what relationship among those data.
3. View level: The highest level of abstraction describes only part of entire database.
2. Logical level: The next higher level of abstraction, describes what data are stored in the database and what relationship among those data.
3. View level: The highest level of abstraction describes only part of entire database.
Simmi Singh
23 Sep, 2019 11:12 PM
Physical Level - This is the lowest level of data abstraction which describes which describes how the data is to be stored in the database.
Logical level - The level describes the data in the database as well as relations between these database.
View Level- This is the highest level of data abstraction , only some part of actual database is viewed to the user.