Puoi provare questo:
select to_date(20150302,'yyyymmdd') from dual;
o
select to_char(to_date(20150302,'yyyymmdd'),'mm/dd/yyyy') from dual;
Puoi provare questo:
select to_date(20150302,'yyyymmdd') from dual;
o
select to_char(to_date(20150302,'yyyymmdd'),'mm/dd/yyyy') from dual;