아래 쿼리문을 쿼리분석기에 돌리면 잘 돌아갑니다.
쿼리 분석기에 돌린 쿼리문도 아래쪽에 올렸습니다.
그런데 델파이에서 돌리면 '0' 구문이 잘못되었다고 나오네요
답변 부탁해요 .. ㅠㅠ

    SQL.Clear;
    SQL.BeginUpdate;
    SQL.Add('SELECT right(BTB.ipxx_addr, 3) as drawIP, BTB.macx_addr, C.code_name AS info_name, info_code, rslt_valu, rslt_valu_now, ');
    SQL.Add('       B.comp_name,B.work_grup,BTB.updt_date ');
    SQL.Add('  FROM (SELECT ipxx_addr, macx_addr,info_code, MAX(rslt_valu) AS rslt_valu, MAX(rslt_valu_now) AS rslt_valu_now, max(updt_date) AS updt_date ');
    SQL.Add('          FROM (SELECT ipxx_addr, macx_addr,info_code, rslt_valu, '' AS rslt_valu_now, updt_date ');
    SQL.Add('                  FROM SY_SYTM_INFO ');
    SQL.Add('                 WHERE info_gubn = ' + QuotedStr('0'));
    SQL.Add('                UNION ALL ');
    SQL.Add('                SELECT ipxx_addr, macx_addr,info_code, '' AS rslt_valu, rslt_valu, updt_date ');
    SQL.Add('                  FROM SY_SYTM_INFO ');
    SQL.Add('                 WHERE info_gubn = ' + QuotedStr('1'));
    SQL.Add('              ) AS ATB ');
    SQL.Add('          GROUP BY ipxx_addr, macx_addr,info_code ');
    SQL.Add('       ) AS BTB LEFT OUTER JOIN IP_COLL_INFO B ON B.macx_addr = BTB.macx_addr ');
    SQL.Add(' LEFT OUTER JOIN CD_COMN_CODE C ON C.majr_code = ' + QuotedStr('SYTMINFO'));
    SQL.Add('                                              AND C.minr_code = BTB.info_code ');;
    SQL.Add(' WHERE rslt_valu <> rslt_valu_now ');;
    SQL.EndUpdate;
    Open;

-- 쿼리분석기 --
SELECT right(BTB.ipxx_addr, 3) as drawIP, BTB.macx_addr, C.code_name AS info_name, info_code, rslt_valu, rslt_valu_now,
       B.comp_name,B.work_grup,BTB.updt_date
  FROM (SELECT ipxx_addr, macx_addr,info_code, MAX(rslt_valu) AS rslt_valu, MAX(rslt_valu_now) AS rslt_valu_now, max(updt_date) AS updt_date
          FROM (SELECT ipxx_addr, macx_addr,info_code, rslt_valu, '' AS rslt_valu_now, updt_date
                  FROM SY_SYTM_INFO
                 WHERE info_gubn = '0'
                UNION ALL
                SELECT ipxx_addr, macx_addr,info_code, '' AS rslt_valu, rslt_valu, updt_date
                  FROM SY_SYTM_INFO
                 WHERE info_gubn = '1'
              ) AS ATB
          GROUP BY ipxx_addr, macx_addr,info_code
       ) AS BTB LEFT OUTER JOIN IP_COLL_INFO B ON B.macx_addr = BTB.macx_addr
LEFT OUTER JOIN CD_COMN_CODE C ON C.majr_code = 'SYTMINFO'
                                              AND C.minr_code = BTB.info_code
WHERE rslt_valu <> rslt_valu_now