Explanation:Primary key checks for not null and uniqueness constraint . 9. Drop Table cannot be used to drop a table referenced by a _________ constraint.
A. Local Key
B. Primary Key
C. Composite Key
D. Foreign Key
Answer:A
Explanation:Primary key checks for not null and uniqueness constraint . 9. Drop Table cannot be used to drop a table referenced by a _________ constraint.
A. Local Key B. Primary Key C. Composite Key D. Foreign Key
Explanation:Foreign key is used when primary key of one relation is used in another relation . 10. ____________ is preferred method for enforcing data integrity