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"
Show the average room count of the apartments that have booking status code "Provisional".
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 ''
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 = value
Show the average room count of the apartments that have booking status code `` Provisional '' .