Review Questions 1. What is a view? 2. Which command creates a view? 3. What is a defining query? 4. What happens when a user retrieves data from a view? 5. What are three advantages of using views? 6. Which types of views cannot be updated? 7. Which command deletes a view? 8. Which command gives users access privileges to various portions of the database? 9. Which command terminates previously granted privileges? 10. What is the purpose of an index? 11. How do you create an index? How do you create a unique index? What is the difference between an index and a unique index? 12. Which command deletes an index? 13. Does the DBMS or the user make the choice of which index to use to accomplish a given task