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

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