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It is possible for an index to be applied to all of the following types of...

It is possible for an index to be applied to all of the following types of key columns, except _______.

Select one:

\a. A primary key column

b. A foreign key column

c. A candidate key column

d. Indexes can be applied to all of the types of key columns listed above

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Answer #1

The answer to the question is given below.

Option A. We can use the primary key to create indexing. And in MySql default, primary indexing is applied to the primary key.

Option B. By Default MySql doesn't provide a foreign key in indexing. But it has all of the benefits of creating indexing on the foreign key. It supports the join between the primary and foreign keys. It also helps in the update and deletes. Generally, it is not used in small tables, it is used in big tables.

Option C. We can apply indexing to the candidate key also. There are lots of candidate keys possible in a table. A candidate key is chosen to be the primary key. So, a candidate key can also uniquely specify a tuple(row) in a relation.

Option D. Indexes can be applied to all of the types of key columns listed above.

So, the Correct Answer is Option D.


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