Sql 为前一行添加值

我有一个表

分级机
：

+--------------------------+
|GraderName | Graded_Items |
+--------------------------+
|    A      |       21     |
|    B      |        7     |
|    C      |       17     |
|    D      |       91     |
|    E      |       84     |
|    F      |       52     |
|    G      |       34     |
+--------------------------+

我想把第一行和第二行的
和
放在第二行<第一行、第二行和第三行的代码>总和
，放在第三行；如此类推到其他行。见下文：

+--------------------------------+
|GraderName | Graded_Items       |
+--------------------------------+
|    A      |21                  |
|    B      |21+7                |
|    C      |21+7+17             |
|    D      |21+7+17+91          |
|    E      |21+7+17+91+84       |
|    F      |21+7+17+91+84+52    |
|    G      |21+7+17+91+84+52+34 |
+--------------------------------+

我想达到这个结果：

+--------------------------+
|GraderName | Graded_Items |
+--------------------------+
|    A      |       21     |
|    B      |       28     |
|    C      |       45     |
|    D      |      136     |
|    E      |      220     |
|    F      |      272     |
|    G      |      306     |
+--------------------------+

我尝试了以下查询：

SELECT Grader,Graded_Items FROM Grader WHERE Grader='A'
UNION ALL
SELECT MAX(Grader),SUM(Graded_Items) FROM Grader WHERE Grader in ('A','B')
UNION ALL
SELECT MAX(Grader),SUM(Graded_Items) FROM Grader WHERE Grader in ('A','B','C')
UNION ALL
SELECT MAX(Grader),SUM(Graded_Items) FROM Grader WHERE Grader in ('A','B','C','D')
UNION ALL
SELECT MAX(Grader),SUM(Graded_Items) FROM Grader WHERE Grader in ('A','B','C','D','E')
UNION ALL
SELECT MAX(Grader),SUM(Graded_Items) FROM Grader WHERE Grader in ('A','B','C','D','E','F')

但是，我的问题是表一直在变化，例如
GraderName
同时填充其相应的
Graded\u项。还有其他方法可以达到我的预期结果吗？
使用
Sum over（）
技巧获得运行总数

select GraderName, 
       sum(Graded_Items) over(order by GraderName) As Graded_Items
From yourtable  



使用
Sum over（）

select GraderName, 
       sum(Graded_Items) over(order by GraderName) As Graded_Items
From yourtable  



哇！我不知道。我会帮上大忙的。谢谢^_^真 的！我不知道。我会帮上大忙的。谢谢^_^可能的重复可能的重复