SQL Server：MAX（DATE）の行のみを選択します

rownumber() over(...)の場合 利用可能です....

select OrderNO,
       PartCode,
       Quantity
from (select OrderNO,
             PartCode,
             Quantity,
             row_number() over(partition by OrderNO order by DateEntered desc) as rn
      from YourTable) as T
where rn = 1