How many candidate keys are possible with the table?RollNo Name Mobile City 1 Arun 91 Delhi 2 Sanjay 92 Mumbai 3 Arun 93 Noida 4 Varun 94 Guwahati 5 Arti 95 Kolkata
| RollNo | Name | Mobile | City |
| 1 | Arun | 91 | Delhi |
| 2 | Sanjay | 92 | Mumbai |
| 3 | Arun | 93 | Noida |
| 4 | Varun | 94 | Guwahati |
| 5 | Arti | 95 | Kolkata |
- One
- Two
- Three
- Four
The Correct Option is B
Solution and Explanation
A candidate key is a minimal set of attributes that uniquely identifies each tuple in a table.
In the given table:
Therefore, the candidate keys are RollNo and Mobile.
Thus, the answer is (2) Two.
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