Netezza SQL：在窗口框架中指定偏移

Question

为窗口化分析函数创建“框架”时，可以指定要“回顾”的字面数。例如，以下将获得一个家庭的26周的周销售额。

,sum(sales) over (partition by household_id order by week_id rows 26 preceding) as x26 

但是...如果你想回头（或转发）与偏移量？例如，如果在第n周，你想要在第n周前8周结束的26周的销售额？当我输入这个内容时，我想到我可能会部分地完成它。即，

,sum(sales) over (partition by household_id order by week_id rows 34 preceding) as x34 
,sum(sales) over (partition by household_id order by week_id rows 8 preceding) as x8 

...并有trailing26_offeset8 = x34 - x8

唔...很高兴我问。但无论如何，你知道是否有一个功能可以让我在分区规范本身中指定偏移量吗？

谢谢！

Answer 1

尝试在窗口范围内使用规范between：

sum(sales) over (partition by household_id 
       order by week_id 
       rows between 34 preceding and 8 preceding 
       ) as x34