Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE department (dept_code VARCHAR, dept_name VARCHAR)
TABLE: CREATE TABLE professor (dept_code VARCHAR)

### Question ###
How many professors who are from either Accounting or Biology department?

### Accurate SQL ###

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'