8 to 14. will rate ?? if all are answered

VWHICh 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 diffe 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 gi task