添加在SQL Server中运行总计列

Question

我有如下一个SQL Server查询的结果集：

项目周刊金额

1  1  500 
1  2  -100 
1  3  -200 
2  1  800 
2  2  -600 
2  3  -800 

我想知道的是，是否有可能得出第四列，给出每个项目的总额金额？

我想要的结果如下：

项目周合计数额

1  1  500 500 
1  2  -100 400 
1  3  -200 200 
2  1  800 800 
2  2  -600 200 
2  3  -800 -600 

我使用SQL Server 2008的

Answer 1

尝试SUM() OVER

SELECT 
     item, 
     week, 
     amount, 
     SUM(amount) over (partition by item order by Week) as Total 
FROM yourTable 

Answer 2

您需要一个SQL Server 2012 t o支持ROWS PRECEDING功能。

SELECT 
    item, 
    week, 
    amount, 
    SUM(amount) over (partition by item order by Week 
     ROWS UNBOUNDED PRECEDING 
) as Total 
FROM yourTable 

http://stevestedman.com/2012/03/rows-preceding-and-following-in-tsql-2012/