mysql求和怎么写 mysql字段求和

mysql语法求和

你试试我也不清楚了

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select sum (分数) from+表名+where +序号

in (select max(序号) from +表名+ group by+姓名)

select sum([value]-[fee]*100) from pos where user=1

一般用SQL语句求和的格式是：

select sum(column_name) from db_name where search_condition

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 allmoney200

select sum(money) as money, id

from recharge

where time between xxx and xxx

group by id

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