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 CLASS ( crs_code VARCHAR )
TABLE: CREATE TABLE course ( dept_code VARCHAR, crs_credit INTEGER, crs_code VARCHAR )

### Question ###
Find the total credits of all classes offered by each department.

### Accurate SQL ###

SELECT SUM(T1.crs_credit), T1.dept_code FROM course AS T1 JOIN CLASS AS T2 ON T1.crs_code = T2.crs_code GROUP BY T1.dept_code