Explanation:None. 8. Which one of the following uniquely identifies the elements in the relation?
A. Secondary Key
B. Primary key
C. Foreign key
D. Composite key
Answer:A
Explanation:None. 8. Which one of the following uniquely identifies the elements in the relation?
A. Secondary Key B. Primary key C. Foreign key D. Composite key
Explanation:Primary key checks for not null and uniqueness constraint . 9. Drop Table cannot be used to drop a table referenced by a _________ constraint.