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

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"