SQL> GRANT SELECT, INSERT ON employee TO entry;
SQL> GRANT SELECT, INSERT ON customer TO entry;
SQL> GRANT SELECT, UPDATE ON employee TO maintenance;
SQL> GRANT SELECT, UPDATE ON customer TO maintenance;
SQL> GRANT EXECUTE ON validate_salary TO maintenance;
SQL> GRANT SELECT, INSERT, UPDATE, DELETE ON employee TO manager;
SQL> GRANT SELECT, INSERT, UPDATE, DELETE ON customer TO manager;
SQL> GRANT EXECUTE ON validate_salary TO manager;
SQL> GRANT EXECUTE ON adjust_salary TO manager;
SQL>