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

Question: What are the booking start and end dates of the apartments with type code "Duplex"?
SQL: SELECT T1.booking_start_date, T1.booking_start_date FROM Apartment_Bookings AS T1 JOIN Apartments AS T2 ON T1.apt_id = T2.apt_id WHERE T2.apt_type_code = "Duplex"