Saved Bookmarks
| 1. |
Describe the three levels of data abstraction? |
|
Answer» 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. |
|