What is Data level structure?

Answer 1

three levels of data abstraction

are:

1. Physical level : how the data is

stored physically and where it is

stored in

database.

2. Logical level : what information

or data is stored in the database

(like what is the

datatype or what is format of

data.

3.View level : end users work on

view level. if any amendment is

made it can be

saved by other name.

for the database to be usable it

must retrieve data efficently.this

efficency led designer to use

complex data structure in the

database