按组SQL总计运行(Oracle) [英] Running Total by Group SQL (Oracle)

问题描述

我在Oracle数据库中有一个表，该表具有以下相关字段:位置，产品，日期，金额.我想编写一个查询，该查询将按位置，产品和日期获得运行总额.我在下面的示例表中列出了我希望得到的结果.

I have a table in an Oracle db that has the following fields of interest: Location, Product, Date, Amount. I would like to write a query that would get a running total of amount by Location, Product, and Date. I put an example table below of what I would like the results to be.

我可以获取运行总额，但到达新的位置/产品后无法重置.这是到目前为止的代码，非常感谢您的帮助，我觉得这是一个简单的解决方法.

I can get a running total but I can't get it to reset when I reach a new Location/Product. This is the code I have thus far, any help would be much appreciated, I have a feeling this is a simple fix.

select a.*, sum(Amount) over (order by Location, Product, Date) as Running_Amt
from Example_Table a

+----------+---------+-----------+------------+------------+
| Location | Product | Date      | Amount     |Running_Amt |
+----------+---------+-----------+------------+------------+
| A        | aa      | 1/1/2013  | 100        | 100        |
| A        | aa      | 1/5/2013  | -50        | 50         |
| A        | aa      | 5/1/2013  | 100        | 150        |
| A        | aa      | 8/1/2013  | 100        | 250        |
| A        | bb      | 1/1/2013  | 500        | 500        |
| A        | bb      | 1/5/2013  | -100       | 400        |
| A        | bb      | 5/1/2013  | -100       | 300        |
| A        | bb      | 8/1/2013  | 250        | 550        |
| C        | aa      | 3/1/2013  | 550        | 550        |
| C        | aa      | 5/5/2013  | -50        | 600        |
| C        | dd      | 10/3/2013 | 999        | 999        |
| C        | dd      | 12/2/2013 | 1          | 1000       |
+----------+---------+-----------+------------+------------+

推荐答案

嗯，我想我已经解决了.

Ah, I think I have figured it out.

select a.*, sum(Amount) over (partition by Location, Product order by Date) as Running_Amt
from Example_Table a

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