MySQL累积求和

 

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

CREATE TABLE cum_demo
(id INT,money INT,PRIMARY KEY (id))

 

插入数据

insert into cum_demo(id,money)
values (1,10),(2,20),(3,30),(4.40);

 

求累加

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