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 (school_code VARCHAR, dept_code VARCHAR)
TABLE: CREATE TABLE professor (dept_code VARCHAR)

### Question ###
What is the number of professors for different school?

### Accurate SQL ###

SELECT COUNT(*), T1.school_code FROM department AS T1 JOIN professor AS T2 ON T1.dept_code = T2.dept_code GROUP BY T1.school_code