Database: apartment_rentals
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"