Describe the three levels of data 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.


Popular posts from this blog

About 12 Alwars

Post thumbnails from external URLs don’t appear in Blogger. How to resolve?

What is the unicode character for the close symbol?