Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE Apartments (apt_type_code VARCHAR, room_count INTEGER)
### Question:
Show the top 3 apartment type codes sorted by the average number of rooms in descending order.
### Answer:
SELECT apt_type_code FROM Apartments GROUP BY apt_type_code ORDER BY AVG(room_count) DESC LIMIT 3