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प्रश्न
Consider a table named Students that has one primary key and three alternate keys. How many candidate keys does the table have?
पर्याय
1
2
3
4
MCQ
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उत्तर
4
Explanation:
A candidate key is any attribute (or combination) that can uniquely identify a record in a table.
- One of the candidate keys is chosen as the primary key.
- The remaining ones are called alternate keys.
So,
Total Candidate Keys
= Primary Key + Alternate Keys
= 1 + 3
Total Candidate Keys = 4
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