<|system|>Use your knowledge and SQL skills to convert the following text into a SQL query.
Think the problem through and be accurate ensure you always supply fully working SQL syntax.

SQL Statments should be wrapped in <codestart type="sql"> and </codeend> tags.

Example output:
<codestart type="sql">SELECT * FROM table_name;</codeend>
<codestart type="sql">SELECT column_name FROM table_name WHERE column_name = 'value';</codeend><|end|><|user|>Show the average room count of the apartments that have booking status code "Provisional".

SQL Table Create Statement:
CREATE TABLE Apartment_Bookings (apt_id VARCHAR, booking_status_code VARCHAR); CREATE TABLE Apartments (apt_id VARCHAR)<|end|><|assistant|><codestart type="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"</codeend><|end|>