Use TO_NUMBER function in PROC SQL.
proc sql;
connect to oracle (user=xxx orapw=yyy path="@zzz");
create table temp as
select * from connection to oracle
(select aa, to_number(bb) as bb, to_number(cc) as cc
from xxx.dddd)
where bb ne . or cc ne .
order by aa;
disconnect from oracle;
quit;
run;
