query: SELECT zip_code FROM weather GROUP BY zip_code HAVING avg(mean_visibility_miles)  <  10
question: For each zip code, select all them that have an average mean visiblity below 10.
query_toks: SELECT zip_code FROM weather GROUP BY zip_code HAVING avg ( mean_visibility_miles ) < 10
query_toks_no_value: select zip_code from weather group by zip_code having avg ( mean_visibility_miles ) < value
question_toks: For each zip code, select all them that have an average mean visiblity below 10.