query: SELECT location_code ,  count(*) FROM Document_locations GROUP BY location_code
question: What-all are the codes of each location and the number of documents in that location?
query_toks: SELECT location_code , count ( * ) FROM Document_locations GROUP BY location_code
query_toks_no_value: select location_code , count ( * ) from document_locations group by location_code
question_toks: What-all are the codes of each location and the number of documents in that location?