运行总计和子组

Question

我试图通过查询现有视图来获得运行总数，但我首先需要精确的分组。我知道我可以使用 Sum(xx) over (Partition by xx Order by xx) 来做运行总数，但我只知道如何在简单的情况下使用它。

运行视图时的数据如下所示（有一些无用的额外列），除了没有 Running_Stock 列，这是我想要得到的：

+---------+----------+---------+------------+-------+---------+---------------+
| Product | Version  | Country |    Week    | sales | returns | Running_stock |
+---------+----------+---------+------------+-------+---------+---------------+
| Pdt1    | pdt1ver1 | Aus     | 2020M01W01 |    10 |       3 |             7 |
| pdt1    | pdt1ver1 | Fra     | 2020M01W01 |     8 |       2 |             6 |
| pdt1    | pdt1ver1 | Fra     | 2020M01W02 |    15 |       5 |            16 |
| pdt1    | pdt1ver2 | UK      | 2020M01W01 |    20 |       5 |            15 |
| pdt1    | pdt1ver2 | UK      | 2020M01W02 |    15 |       1 |            29 |
| pdt1    | pdt1ver2 | UK      | 2020M01w03 |     9 |       0 |            38 |
| pdt2    | pdt2ver1 | Fra     | 2020M01W01 |     5 |       1 |             4 |
| pdt2    | pdt2ver1 | Fra     | 2020M01W02 |     3 |       0 |             7 |
+---------+----------+---------+------------+-------+---------+---------------+

对于给定国家/地区的每个产品版本，我应该能够在任何时间点获得 running_stock。库存是通过 "sales - returns".

计算的

我天真地以为我可以做一个简单的:

Select Product, Version, Country, Week, Sales, Returns,
Sum(sales-returns) over(partition by Version, Country Order by Week) Running_stock
from MyView

但我得到的只是每个“组”，每一行都有相同的运行股票，而且它甚至不是正确的总和（实际上是总和 * 2）。

Answer 1

您很接近，但您当前的查询正在对每个组中的所有行执行 SUM。您只需要为您的累计总和添加一个行规范：

Sum(sales-returns) over(
  partition by Version, Country 
  Order by Week 
  ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW -- all rows including current row
) Running_stock

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