Explanation:Street is the only attribute which can occur more than once. 7. A attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation .
A. Candidate
B. Primary
C. Super
D. Sub
Answer:A
Explanation:Street is the only attribute which can occur more than once. 7. A attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation .
A. Candidate B. Primary C. Super D. Sub
Explanation:The primary key has to be referred in the other relation to form a foreign key in that relation . 8. The relation with the attribute which is the primary key is referenced in another relation. The relation which has the attribute as primary key is called