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 Documents (template_id VARCHAR)
TABLE: CREATE TABLE Templates (template_type_code VARCHAR, template_id VARCHAR)

### Question ###
Show all template type codes and the number of documents using each type.

### Accurate SQL ###

SELECT T1.template_type_code, COUNT(*) FROM Templates AS T1 JOIN Documents AS T2 ON T1.template_id = T2.template_id GROUP BY T1.template_type_code