11. The EXISTS keyword will be true if:

A. any row in the subquery meets the condition only.
B. all rows in the subquery fail the condition only.
C. both of these two conditions are met.
D. neither of these two conditions is met.

12. Changing cardinalities in a database is:

A. a common database design task.
B. a rare database design task, but does occur.
C. a database design task that never occurs.
D. is impossible to do, so a new database must be constructed and the data moved into it.

13. The NOT EXISTS keyword will be true if:

A. any row in the subquery meets the condition.
B. all rows in the subquery fail the condition.
C. both of these two conditions are met.
D. neither of these two conditions is met.

14. The data model that is produced from reverse engineering is:

A. a conceptual model.
B. an internal model.
C. a logical model.
D. None of the above is correct.

15. To drop a column that is used as a foreign key, first:

A. drop the primary key.
B. drop the table containing the foreign key..
C. drop the foreign key constraint.
D. All of the above must be done.