CREATE TABLE Apartment_Bookings (apt_id VARCHAR, booking_status_code VARCHAR)
CREATE TABLE Apartments (apt_id VARCHAR)

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 "Provisional" = "T1"."booking_status_code"