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 complaints ( complaint_type_code VARCHAR )

### Question ###
How many distinct complaint type codes are there in the database?

### Accurate SQL ###

SELECT COUNT(DISTINCT complaint_type_code) FROM complaints