Table schema:
CREATE TABLE Apartment_Bookings (apt_id VARCHAR, booking_status_code VARCHAR); CREATE TABLE Apartments (apt_id VARCHAR)

Question: Show the average room count of the apartments that have booking status code "Provisional".
SQL: SELECT AVG(room_count) FROM Apartment_Bookings AS T1 JOIN Apartments AS T2 ON T1.apt_id = T2.apt_id WHERE T1.booking_status_code = "Provisional"