Plesk panel
uder the Application and Services tab Select databases
after that you will see complete list of your database Click on the database left side check box and select database which you want delete and then click on remove button to remove database completely.
Cpanel
Removing a database will delete that database ENTIRELY from the server. Please make sure you have saved a copy of the database if you want to keep any of the data in contained in it.
To remove a database:
Click on the