unbounded preceding,purpleplace怎么玩

by deptno order by salrows between unbounded preceding and
total_moneyfromtb_orders;2 unbounded preceding 和 current row
preceding 表示之前加上数字表示之前多少行,加上unbounded表示之前
ridge racer unbounded(xbox360)
hive窗口函数合集持续更新