How to fix WordPress Database Connection Error even Database Setting is Correct.

You will find it weird when you get an error establishing database connection while trying to set up your WordPress and you've made sure that your database name, username, and password is exactly the same as your wp-config.php file. Well, assume that you have your database setup correctly, your username and password is correct, you have also linked up your database & username together and the privilege to access the WordPress database is correct. Once refreshing your WordPress page you will get an error "Error establishing a database connection".
I will show you why and how to fix it in this video.