Explanation:Key is the constraint which specifies uniqueness. 5. Which one of the following attribute can be taken as a primary key ?
A. Name
B. Street
C. Id
D. Department
Answer:A
Explanation:Key is the constraint which specifies uniqueness. 5. Which one of the following attribute can be taken as a primary key ?
A. Name B. Street C. Id D. Department
Explanation:The attributes name , street and department can repeat for some tuples.But the id attribute has to be unique .So it forms a primary key. 6. Which one of the following cannot be taken as a primary key ?