SELECT count(*) FROM employee AS T1 JOIN CLASS AS T2 ON T1.EMP_NUM  =  T2.PROF_NUM WHERE T1.EMP_LNAME  =  'Graztevski'
How many classes are professor whose last name is Graztevski has?
SELECT count ( * ) FROM employee AS T1 JOIN CLASS AS T2 ON T1.EMP_NUM = T2.PROF_NUM WHERE T1.EMP_LNAME = 'Graztevski '
select count ( * ) from employee as t1 join class as t2 on t1 . emp_num = t2 . prof_num where t1 . emp_lname = value
How many classes are professor whose last name is Graztevski has ?