CREATE TABLE roller_coaster (roller_coaster_id NUMBER, name CLOB, park CLOB, country_id NUMBER, length NUMBER, height NUMBER, speed CLOB, opened CLOB, status CLOB)
CREATE TABLE country (country_id NUMBER, name CLOB, population NUMBER, area NUMBER, languages CLOB)

What are the lengths and heights of roller coasters?
SELECT length, height FROM roller_coaster
SELECT "length", "height" FROM "roller_coaster"