Microsoft just released SQL Server 2012 Express for download.
Download it from: SQL Server 2012
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You can remove users and databases in MySQL eg. via phpMyAdmin or from Command Line Client as shown here.
mysql> DROP USER myuser@localhost; [Enter]
mysql> DROP DATABASE mydatabase; [Enter]
Done :)
Users can be created in several ways in MySQL. Eg. via phpMyAdmin or Command Line Client, which I prefer and will demonstrate.
Open up Command Line Client and enter your root password to login.
You should now get the welcome screen and be in mysql>_
We are now ready to create our database and associated user.
CREATE DATABASE mydatabase; [Enter]
GRANT ALL PRIVILEGES on mydatabase.* to myuser@localhost identified by ‘userpassword’; [Enter]
FLUSH PRIVILEGES; [Enter]
That’s it, you are now ready to use your database.
Usually I use domain_com as database and username for a better overview.