1.What is the purpose of the DELETE command? 2. What is the purpose of the CREATE VIEW and DROP VIEW commands? 3. What set operators are available in SQL? 4. What is the purpose of OUTER JOIN? 5. What...

1.What is the purpose of the DELETE command? 2. What is the purpose of the CREATE VIEW and DROP VIEW commands? 3. What set operators are available in SQL? 4. What is the purpose of OUTER JOIN? 5. What is the purpose of the IS NULL keyword? 6. What is the purpose of the EXISTS keyword? 7. What is the purpose of the NOT keyword?