Show the top 3 apartment type codes sorted by the average number of rooms in descending order.
SELECT apt_type_code FROM Apartments GROUP BY apt_type_code ORDER BY avg(room_count) DESC LIMIT 3
SELECT apt_type_code FROM Apartments GROUP BY apt_type_code ORDER BY avg(room_count) DESC LIMIT 3
[{'apt_type_code': 'Studio'}, {'apt_type_code': 'Flat'}, {'apt_type_code': 'Duplex'}]