Check out example codes for "grant revoke privileges to mysql username". It will help you in understanding the concepts better.

Code Example 1

#in SQL execute
#GRANT type_of_permission ON database_name.table_name TO 'username'@'localhost';
GRANT ALL PRIVILEGES ON * . * TO 'username'@'localhost';
#reload all the privileges
FLUSH PRIVILEGES;

#Show Privileges
SHOW GRANTS FOR 'username'@'localhost';

#Revoke Privileges
REVOKE type_of_permission ON database_name.table_name FROM 'username'@'localhost';

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