The first thing you need to do is to log in to your database. Normally you either have a local version of MySQL or you have to SSH into your web server.
When you're in the MySQL command line, you're ready to proceed to the next step.
Creating a database
Using commands to create a new database is actually very simple. Just write the following command and hit enter:
$ create database NAMEOFTHEDATABASE;
You can call it whatever you want. Let's just quickly check that the database was created.
$ show databases;
If you run the code above, you'll see a list of databases. Hopefully, the one you created should be in there somewhere.
Deleting a database
Sometimes you need to delete a database. Write the following command (be really sure that you know what you are doing):
$ drop database NAMEOFTHEDATABASE;
And that's it. The database is gone and there's no way of getting it back (as long as you don't have a backup).