declare
cursor t_sor(a number,b number) is
select * from (select rownum rm,AA.* from tablename AA order by number) where rm<=a and rm>=b;
m number:=1;
n number:=5;
begin
for num in m..n loop
for v_sor in t_sor loop
.......
end loop;
m:=m+5;
n:=n+5;
end loop;
end;