Which apartments have unit status availability of both 0 and 1? Return their apartment numbers.
select t1.apt_number from apartments as t1 join view_unit_status as t2 on t1.apt_id = t2.apt_id where t2.available_yn = 0 intersect select t1.apt_number from apartments as t1 join view_unit_status as t2 on t1.apt_id = t2.apt_id where t2.available_yn = 1