query: SELECT grade ,  count(DISTINCT classroom) ,  count(*) FROM list GROUP BY grade
question: Each grade, report that grade, that number classroom which it is taught and that total number student that grade.
query_toks: SELECT grade , count ( DISTINCT classroom ) , count ( * ) FROM list GROUP BY grade
query_toks_no_value: select grade , count ( distinct classroom ) , count ( * ) from list group by grade
question_toks: Each grade, report that grade, that number classroom which it is taught and that total number student that grade.