mysql 按条件分组累计求和

select (select avg(sales) from 表名 b where (a.date-b.date) between 0 and 20) as [前20日平均销量],* from 表名 a

创建表：

create table test

(date datetime,

userid varchar(2),

amount int)

insert into test values ('2018-10-02 00:00:00','u1',20)

insert into test values ('2018-10-02 21:09:28','u2',20)

insert into test values ('2018-10-02 21:09:29','u3',30)

insert into test values ('2018-10-03 21:36:44','u1',20)

insert into test values ('2018-10-03 21:36:46','u2',72)

insert into test values ('2018-10-03 21:36:52','u3',30)

insert into test values ('2018-10-30 21:36:54','u1',10)

insert into test values ('2018-10-30 21:36:57','u2',10)

执行：

select a.date,a.userid,a.amount,sum(b.amount) from test a,test b where a.userid=b.userid and a.date>=b.date group by a.date,a.userid,a.amount

结果：

1、创建三张测试表，

create table pw_memberinfo(uid int, name varchar(20))

create table pw_members(companyid int, uid int)

create table pw_memberdata(uid int, deposit int, ddeposit int, money int)

2、三张表，分别插入测试数据，

insert into pw_members values(1, 1)

insert into pw_members values(1, 2)

insert into pw_members values(1, 3)

insert into pw_memberinfo values(1, 'name_1')

insert into pw_memberinfo values(2, 'name_2')

insert into pw_memberinfo values(3, 'name_3')

insert into pw_memberdata values(1,30,50,150)

insert into pw_memberdata values(2,77,50,12)

insert into pw_memberdata values(3,44,50,82)

3、查看pw_memberdata表中的记录，select * from pw_memberdata t，

4、编写sql语句，

select * from (SELECT i.uid, sum(deposit+ddeposit+money) as allmoney

FROM pw_memberinfo i

LEFT JOIN pw_members m ON m.uid=i.uid

LEFT JOIN pw_memberdata d ON i.uid=d.uid

group by i.uid

) t where allmoney>200

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