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
apartments with unit status availability of both 0 and 1 refers to finding apartments that have records in the View_Unit_Status with available_yn equal to both 0 and 1; apartment numbers refer to apt_number;