query: SELECT classroom ,  count(*) FROM list WHERE grade  =  "4" GROUP BY classroom
question: Each fourth-grade classroom, show classroom number and the total number student using.
query_toks: SELECT classroom , count ( * ) FROM list WHERE grade = `` 4 '' GROUP BY classroom
query_toks_no_value: select classroom , count ( * ) from list where grade = value group by classroom
question_toks: Each fourth-grade classroom, show classroom number and the total number student using.