Which of the following can be considered as the primary key?
A. Name
B. Roll no.
C. Marks
D. Street
Answer:B
Which of the following can be considered as the primary key?
A. Name B. Roll no. C. Marks D. Street
Explanation: The attribute associated with the primary key should be unique. In any class, more than one student can have a common name, more than one student can get equal marks in any subject, and their street can also be common. So here, the roll number can be considered as the primary key.