有如下表
| id |
money |
| 1 |
10 |
| 2 |
20 |
| 3 |
30 |
| 4 |
40 |
求出如下数据
| id |
money |
cum |
| 1 |
10 |
10 |
| 2 |
20 |
30 |
| 3 |
30 |
60 |
| 4 |
40 |
100 |
建表
|
1
2
|
CREATE
TABLE
cum_demo
(id
INT
,money
INT
,
PRIMARY
KEY
(id))
|
插入数据
|
1
2
|
insert
into
cum_demo(id,money)
values
(1,10),(2,20),(3,30),(4.40);
|
求累加
|
1
2
3
4
5
|
SELECT
a.id,a.money,
SUM
(lt.money)
as
cum
FROM
cum_demo a
JOIN
cum_demo lt
ON
a.id >= lt.id
GROUP
BY
a.money
ORDER
BY
id
|
结果
| id | money | cum |
| 1 | 10 | 10 |
| 2 | 20 | 30 |
| 3 | 30 | 60 |
| 4 | 40 | 100 |