query: SELECT document_type_code ,  count(*) FROM Documents GROUP BY document_type_code
question: How many document got of each types?
query_toks: SELECT document_type_code , count ( * ) FROM Documents GROUP BY document_type_code
query_toks_no_value: select document_type_code , count ( * ) from documents group by document_type_code
question_toks: How many document got of each types?