grant usage on *.* for every database code example

Example 1: mysql grant all privileges to a user

GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'localhost';

Example 2: grant all privileges mysql

/*
The GRANT statement is used to assign full control over specific database by providing all priviledge.
Follow below statement for assign priviledge to user
*/

Syntax: 
GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'localhost';