SELECT UNIQUE a.cod_sp,a.cod_sp_sec,b.nom_sp 
     FROM cptb00001 a,cotb00001 b 
     WHERE  a.cod_sp_sec = a.cod_sp_sec AND  a.cod_sp = b.cod_sp AND 
           a.cod_sp_sec=b.cod_sp_sec AND a.status_t is null AND a.cod_sp = 23 
     ORDER BY 1,2