select UNIQUE a.tipo,a.num_oc,a.fech_oc,b.nom_sp,a.c_flete,a.otros_g,
 SUM(d.cantidad * d.precio)
  FROM cotb00014 a,cotb00001 b,cotb00015 d
  WHERE b.cod_sp = a.cod_sp AND b.cod_sp_sec = a.cod_sp_sec AND
        a.num_oc = d.num_oc AND a.tipo = d.tipo AND
        a.fech_oc between "010197" AND "120897" AND
        a.tipo = a.tipo AND a.cod_sp_sec = a.cod_sp_sec AND
        a.status_t is null
 GROUP BY 1,2,3,4,5,6
  ORDER BY 1,2