hive之窗口函數理解與實踐

首先，咱們要知道什麼是窗口子句：sql 須要指定一個窗口的邊界，語法是這樣的：ide ROWS betweenCURRENT ROW | UNBOUNDED PRECEDING | [num] PRECEDING AND  UNBOUNDED FOLLOWING | [num] FOLLOWING| CURRENT ROW函數 或spa RANGE between [num] PRECEDING 

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