Discuss the main characteristics of the database approach and how it differs from traditional file..

Discuss the main characteristics of the database approach and how it differs from traditional file system. b. Discuss the main categories of data models. c. Can an identifying relationship of a weak entity type be of a degree greater than two? Discuss. d. What is the difference between logical data independence and physical data independence? Which one is harder to achieve? Why? e. Briefly discuss the different types of update operations on a relation.