Consider a database name “interviewmania” whose attributes

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Consider a database name “interviewmania” whose attributes are internid (primary key), subject.
Internid = {1, 2, 3, 4, 5, 6}
Subject = {sql, oop, sql, oop, c, c++}
If these are one to one relation then what will be the output of the following query?
```
SELECT internid
FROM interviewmania
WHERE subject IN (c, c++, oop, SQL);
```

1. Empty set
2. {5, 6}
3. {3, 4}
4. {1, 2, 3}
5. None of these

Correct Option: A

Empty set