There are many situations where you may need to copy your WordPress database. The most common scenario would be to set up a development site in order to test new themes or features. In the past you may have exported a copy and then re-imported that to a new blank database. If you want to copy your database onto the same server, then this is probably the easiest way.
This quick tip is based on a phpMyAdmin operations feature, so it won’t apply to you if your host is using something else for managing databases.