如何oracle的存儲(chǔ)過(guò)程，為什么有兩段相似的代碼，而不是寫(xiě)一段？

BEGIN
   AN_O_RET_CODE := 0;
   AC_O_RET_MSG  := '操作成功';
   select COUNT (*) INTO COUNTALL from (
       select kf_id,o.name kf_name,sessionid,decode(score,'1','點(diǎn)贊','2','不點(diǎn)贊','0','放棄',score) as satis,to_char(create_time,'yyyy-mm-dd HH:MM:ss')
       from tb_zxkf_evaluate e
       left join tb_sso_oper o on e.kf_id = o.logincode
       where to_char(create_time,'yyyymmdd') between BEGINDATE and ENDDATE
   );
  limit2:=limit1;
  if limit1<0 then
    limit2:=COUNTALL;
  end if;
  --/* 結(jié)果集返回 */
  OPEN CUR_RET FOR
  SELECT * FROM (SELECT  ROWNUM AS ROW_NUM,WM.* FROM(
         select kf_id,o.name kf_name,sessionid,decode(score,'1','點(diǎn)贊','2','不點(diǎn)贊','0','放棄',score) as satis,to_char(create_time,'yyyy-mm-dd HH:MM:ss') as create_time
         from tb_zxkf_evaluate e
         left join tb_sso_oper o on e.kf_id = o.logincode
         where to_char(create_time,'yyyymmdd') between BEGINDATE and ENDDATE
  )WM order by create_time desc) WHERE ROW_NUM BETWEEN  start1  AND  limit2;
  EXCEPTION
    WHEN OTHERS THEN
        AN_O_RET_CODE := -1;
        AC_O_RET_MSG  := '錯(cuò)誤代碼:' || SQLCODE || CHR(13) || '錯(cuò)誤信息:' || SQLERRM;
END ZXKF_SatisDet;