HIVE窗口函数---窗口大小（累加等）

参考链接:https://www.cnblogs.com/alexzhang92/p/10650990.html

select name,orderdate,cost,

sum(cost) over() as sample1,--所有行相加

sum(cost) over(partition by name) as sample2,--按name分组，组内数据相加

sum(cost) over(partition by name order by orderdate) as sample3,--按name分组，组内数据累加

sum(cost) over(partition by name order by orderdate rows between UNBOUNDED PRECEDING and current row ) as sample4 ,--和sample3一样,由起点到当前行的聚合

sum(cost) over(partition by name order by orderdate rows between 1 PRECEDING and current row) as sample5, --当前行和前面一行做聚合

sum(cost) over(partition by name order by orderdate rows between 1 PRECEDING AND 1 FOLLOWING ) as sample6,--当前行和前边一行及后面一行

sum(cost) over(partition by name order by orderdate rows between current row and UNBOUNDED FOLLOWING ) as sample7 --当前行及后面所有行

from business;

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