how to assisn a database to a user in ubantu code example

Example 1: mysql add user with all privileges

# First Login mysql shell..
sudo mysql -u root -p 
CREATE USER 'username'@'localhost' IDENTIFIED BY 'P4ssW0rd';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost';
FLUSH PRIVILEGES;

Example 2: create mysql user with privileges

GRANT type_of_permission ON database_name.table_name TO ‘username’@'localhost’;