高难度的sql，谁能帮帮我

Question

select pic_title,pic_path,ID,view_path,pic_size from pic t where program_no='1' and pic_Type in ('gif' ) and to_number(substr(pic_Size,1,instr(pic_Size,'x')-1))<=128     and to_number(substr(pic_Size,instr(pic_Size,'x')+1))<=128   order by  to_number(substr(pic_Size,1,instr(pic_Size,'x')-1)) desc,to_number(substr(pic_Size,instr(pic_Size,'x')+1)) desc ) ,pic_title,pic_path,ID,view_path/////
,pic_title desc ,pic_path desc ,ID desc ,view_path desc