What are the allergy types and how many allergies correspond to each one?
SELECT allergytype ,  count(*) FROM Allergy_type GROUP BY allergytype
SELECT allergytype ,  count(*) FROM Allergy_type GROUP BY allergytype
[{'AllergyType': 'animal', 'count(*)': 4}, {'AllergyType': 'environmental', 'count(*)': 3}, {'AllergyType': 'food', 'count(*)': 7}]