What information do you have on professors in the Accounting department?
select * from professor as t1 join department as t2 on t1.dept_code = t2.dept_code where t2.dept_name = 'Accounting'
Also, what do you have on professors in the Biology department?
select * from professor as t1 join department as t2 on t1.dept_code = t2.dept_code where t2.dept_name = 'Accounting' or t2.dept_name = 'Biology'
How many of them are there?
select count(*) from professor as t1 join department as t2 on t1.dept_code = t2.dept_code where t2.dept_name = 'Accounting' or t2.dept_name = 'Biology'