Question

Which of the following statements would be a valid DROP VIEW statement to remove the two views, which will also display an error if either view doesn't exist?

A) DROP VIEW ALBUM COST, ALBUM ARTIST NAMES;
B) DROP VIEW ALBUM COST, ALBUM ARTIST NAMES CASCADE;
C) DROP VIEW IF EXISTS ALBUM COST, ALBUM ARTIST NAMES;
D) DROP VIEW ALBUM COST AND ALBUM ARTIST NAMES;

Answer 1

The valid DROP VIEW statement to remove views and display an error if any view doesn't exist is B) DROP VIEW ALBUM COST, ALBUM ARTIST NAMES CASCADE. Using CASCADE ensures that dependent objects are also dropped, and omitting 'IF EXISTS' guarantees an error message if a view is missing.

Step-by-step explanation:

The correct statement to remove the two views and display an error if either view doesn't exist would be: B) DROP VIEW ALBUM COST, ALBUM ARTIST NAMES CASCADE;. In SQL, the DROP VIEW statement is used to remove one or more views. If you wish to ensure that an error message is displayed in case any of the views do not exist, you should not use the 'IF EXISTS' clause. Instead, issuing the DROP VIEW command without it would cause the database system to produce an error if one of the specified views cannot be found. The CASCADE keyword is optional and implies that if there are other database objects dependent on these views (like other views, or functions), they will also be dropped.