CREATE TABLE lives_in (stuid NUMBER, dormid NUMBER, room_number NUMBER)
CREATE TABLE dorm (dormid NUMBER, dorm_name CLOB, student_capacity NUMBER, gender CLOB)
CREATE TABLE has_amenity (dormid NUMBER, amenid NUMBER)
CREATE TABLE student (stuid NUMBER, lname CLOB, fname CLOB, age NUMBER, sex CLOB, major NUMBER, advisor NUMBER, city_code CLOB)
CREATE TABLE dorm_amenity (amenid NUMBER, amenity_name CLOB)

What are the first names of all students who are older than 20?
SELECT fname FROM student WHERE age > 20
SELECT "fname" FROM "student" WHERE "age" > 20