rows between unbounded preceding and current row等，unbounded ，preceding ，following，current row含義詳解
unbounded：無界限
preceding：從分割槽第一行頭開始，則為 unbounded。 N為：相對當前行向前的偏移量
following ：與preceding相反,到該分割槽結束，則為 unbounded。N為：相對當前行向後的偏移量
current row：顧名思義，當前行，偏移量為0
例子：
partition by order by asc/desc rows between unbounded preceding and current row
partition by order by asc/desc rows between 1 preceding and 1 following
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