Using a hash of what you are hashing as a salt?

Question

Say a user registers for your site, you hash the password they have chosen then use that hash as a salt and rehash their password with that salt.

Example:

Answer 1

The point of salting is to prevent the use of huge precalculated tables. With this method it is possible to calculate the hash of any password without the need to access your database. You should store a random value and hash the password and that value together.