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)

What are all the different food allergies?
SELECT DISTINCT allergy FROM allergy_type WHERE allergytype = "food"
SELECT DISTINCT "allergy" FROM "allergy_type" WHERE "allergytype" = "food"