CREATE TABLE has_allergy (stuid NUMBER, allergy CLOB)
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)

How many distinct allergies are there?
SELECT COUNT(DISTINCT allergytype) FROM allergy_type
SELECT COUNT(DISTINCT "allergytype") FROM "allergy_type"