CREATE TABLE allergy_type (allergy TEXT, allergytype TEXT)
CREATE TABLE student (stuid DECIMAL, lname TEXT, fname TEXT, age DECIMAL, sex TEXT, major DECIMAL, advisor DECIMAL, city_code TEXT)
CREATE TABLE has_allergy (stuid DECIMAL, allergy TEXT)

How many students are affected by cat allergies?
SELECT COUNT(*) FROM has_allergy WHERE allergy = "Cat"
SELECT COUNT(*) FROM "has_allergy" WHERE "Cat" = "allergy"