Explanation:A common use of the check clause is to ensure that attribute values satisfy specified conditions, in effect creating a powerful type system. 5. Foreign key is the one in which the ________ of one relation is referenced in another relation.
A. Foreign key
B. Primary key
C. References
D. Check constraint
Answer:A
Explanation:A common use of the check clause is to ensure that attribute values satisfy specified conditions, in effect creating a powerful type system. 5. Foreign key is the one in which the ________ of one relation is referenced in another relation.
A. Foreign key B. Primary key C. References D. Check constraint
Explanation:The foreign-key declaration specifies that for each course tuple, the department name specified in the tuple must exist in the department relation. 6. Create table course