SELECT SUM(a.fob+a.costo_flete),count(*) 
     FROM cgtb00018 a,cgtb00017 b
     WHERE a.num_oc = 100 and a.tipo = "02" and
           b.fecha between "010699" and "300699" and
           a.num_oc = b.num_oc and a.tipo = b.tipo and
           a.status_t is null and a.rep_entrada = b.rep_entrada