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)
CREATE TABLE allergy_type (allergy CLOB, allergytype CLOB)

What is the last name of the youngest student?
SELECT lname FROM student WHERE age = (SELECT MIN(age) FROM student)
SELECT "lname" FROM "student" WHERE "age" = (SELECT MIN("age") FROM "student")