Which of the following is NOT a level of data abstraction?

Select one:

a. Physical level

b. Chemical level

c. Logical level

d. View level

Answer: b) Chemical level

Explanation: Data abstraction is the technique through which only the specifically required and major data is extracted from the collection of the data and other characteristic which are not required are removed.

It has three levels physical level that determines the storage of data at low level, logical level defines the relation between the data stored and the highest level is the view level that tells about the interaction with user about the database.

Thus the incorrect option is option (b) which is not a level of the data abstraction model.