How do I change the privileges for MySQL user that is already created?

https://serverfault.com/questions/115950/how-do-i-change-the-privileges-for-mysql-user-that-is-already-created

To list users:

select * from mysql.user;

To show privileges:

show grants for 'user'@'host';

To change privileges, first revoke. Such as:

revoke all privileges on *.* from 'user'@'host';

Then grant the appropriate privileges as desired:

grant SELECT,INSERT,UPDATE,DELETE ON `db`.* TO 'user'@'host';

Finally, flush:

flush privileges;