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

What are the students ids of students who have more than one allergy?
SELECT stuid FROM has_allergy GROUP BY stuid HAVING COUNT(*) >= 2
SELECT "stuid" FROM "has_allergy" GROUP BY "stuid" HAVING COUNT(*) >= 2