Which apartments have type code "Flat"? Give me their apartment numbers.
SELECT apt_number FROM Apartments WHERE apt_type_code  =  "Flat"
SELECT apt_number FROM Apartments WHERE apt_type_code  =  "Flat"
[{'apt_number': 'Suite 645'}, {'apt_number': 'Apt. 585'}, {'apt_number': 'Suite 307'}, {'apt_number': 'Suite 693'}, {'apt_number': 'Apt. 794'}, {'apt_number': 'Apt. 837'}]