How many students are enrolled in any type of accounting course? | Do you mean the course taught by some professor from the accounting department? | Yes
SELECT count ( * )  FROM CLASS AS T1 JOIN enroll AS T2 ON T1.class_code   =   T2.class_code JOIN course AS T3 ON T1.crs_code   =   T3.crs_code JOIN department AS T4 ON T3.dept_code   =   T4.dept_code WHERE T4.dept_name   =   'Accounting'
students enrolled in any type of accounting course refers to COUNT(*) FROM classes, enroll, course, department tables WHERE department name is 'Accounting';