如何在sql server中获取列的运行总和

Question

嗨我有一个名为Qty的列来自表Bills我想要一个列显示Qty列的运行总和,如下所示:

Qty   Run_Sum
1      1
2      3
3      6
4      10
5      15

建议我运行一些感谢的一些合适的方法

Answer 1

如果您的RDBMS支持窗口功能,

对于 SQL Server 2012

SELECT  Qty,
        SUM(Qty) OVER (ORDER BY Qty) AS CumulativeTOTAL
FROM    tableName

• SQLFiddle演示

对于 SQL Server 2008

SELECT a.Qty, (SELECT SUM(b.Qty)
               FROM   TableName b
               WHERE  b.Qty <= a.Qty)
FROM   TableName a
ORDER  BY a.Qty;

• SQLFiddle演示

Answer 2

SQLFiddle演示

SELECT Qty,
SUM(Qty) OVER (ORDER BY Qty) Run_Sum
FROM t ORDER BY Qty

对于2012之前的SQLServer:

select Qty,
(select sum(Qty) from t where Qty<=t1.Qty)
from t t1 order by Qty

SQLFiddle演示

或者您也可以在没有子查询的情况下执行此操作:

select t1.Qty, sum(t2.Qty)
from t t1 
join t t2 on (t1.Qty>=t2.Qty)
group by t1.Qty
order by t1.Qty

SQLFiddle演示