Select *
  from (select s.NUM_SERV
             , DATA_SERV
             , DRT_SERV
             , NOME_SERV
             , STATUS_SER V
             , verifica
             , DATA_APROV
             , DATA_BAIXA
             , STATUS_APROV
             , DRT_ APROV
             , NOME_APROV
             , d.data_direcao
             , d.drt_resp1
             , d.drt_analis ta1
             , d.nome_resp1
             , d.nome_analista1
          from db2admin.servicos s
          left join
               db2admin.direcionamento d
           on  s.num_serv = integer(d.num_serv)
         where status_aprov = '1'
           and s.STATUS_SERV <> 1
           and substr(s.data_serv,7,2) > '07'
        rownumber () over( order by NUM_SERV desc ) AS seqNumber /* ????? */
   FROM myTable) tabela_temp  /* ????? */
 row_next between 0 and 20   /* ????? */
;