創建累積和列

Question

樣品表ID：（num是一個關鍵所以不會有任何重複）

num 
1 
5 
6 
8 
2 
3 

我需要一個查詢，使這個： 所需的輸出： （應進行排序，並具有累積和列）

num cumulative 
1 1 
2 3 
3 6 
5 11 
6 17 
8 25 

在Mysql的我有

Select num as n, 
     (select sum(num) from ID where num <= n) 
from ID order by n; 

我拿起這個例子在這個link但MySqlServer

Answer 1

試試這個：

SELECT num,(SELECT SUM(num) FROM tab WHERE num<=t.num) AS CumulativeSum 
FROM tab t 

Answer 2

由於num是不是唯一的，你可能需要使用ROW_NUMBER在那裏得到一個唯一的編號，然後做總和：

declare @t as table (num int) 

insert into @t (num) values (1) 
insert into @t (num) values (5) 
insert into @t (num) values (6) 
insert into @t (num) values (7) 
insert into @t (num) values (2) 
insert into @t (num) values (3) 

;with rows as (
    select 
     num, 
     ROW_NUMBER() over (order by num) as Row 
    from @t 
) 
select num, (select sum(num) from rows where row <= r.row) 
from rows r