Identify the number of potential candidate keys possible for a relation with 3 attributes (A, B, C). State an example

A candidate key is a set of one or more attributes that can uniquely identify a tuple (or row) in a relation.

For a relation with 3 attributes (A, B, C), the potential candidate keys can be any combination of these attributes that can uniquely identify a tuple.

Let's identify them:

1. A
2. B
3. C
4. AB
5. AC
6. BC
7. ABC

So, there are 7 potential candidate keys possible for a relation with 3 attributes.

Let's take an example:

Consider a relation 'Student' with attributes A = Student_ID, B = Student_Name, C = Student_Email.

In this case, the potential candidate keys could be:

1. Student_ID
2. Student_Name
3. Student_Email
4. Student_ID, Student_Name
5. Student_ID, Student_Email
6. Student_Name, Student_Email
7. Student_ID, Student_Name, Student_Email

However, in practical scenarios, not all of these combinations would be candidate keys. For example, Student_Name cannot be a candidate key because two students can have the same name. The actual candidate keys would depend on the specific characteristics of the data in the relation.