List the codes of all courses that take place in room KLR209.
CREATE TABLE CLASS (class_code VARCHAR, class_room VARCHAR)
SELECT class_code FROM CLASS WHERE class_room = 'KLR209'
### Context: CREATE TABLE CLASS (class_code VARCHAR, class_room VARCHAR) ### Question: List the codes of all courses that take place in room KLR209. ### Answer: SELECT class_code FROM CLASS WHERE class_room = 'KLR209'