query: SELECT Allergy ,  count(*) FROM Has_allergy GROUP BY Allergy
question: With number of students affected Show all allergy.
query_toks: SELECT Allergy , count ( * ) FROM Has_allergy GROUP BY Allergy
query_toks_no_value: select allergy , count ( * ) from has_allergy group by allergy
question_toks: With number of students affected Show all allergy.