Question

我有桌子

create table fct_bonus (
    date timestamp not null,
    type varchar(10) not null,
    amount numeric(19,2) not null,
    userid varchar(30) not null
)

类型可以是IN或OUT，金额始终> 0

我需要在2016-08-01日期找到用户ID 123的来龙去脉，以及balans，这应该算作所有ins减去userid123的所有输出。我使用查询

select distinct userid, type, sum(amount)
from fct_bonus
where userid = 123 and date <= '2016-08-01'
group by type

但我不知道，如何计算balans。请帮忙。

Answer 1

这似乎就是你所描述的：

select userid,
       sum(case when type = 'IN' then 1 else 0 end) as ins,
       sum(case when type = 'OUT' then 1 else 0 end) as outs,
       sum(case when type = 'IN' then amount when type = 'OUT' then - amount end) as balance
from fct_bonus
where userid = 123 and date <= '2016-08-01'
group by userid;

具有相同值的行之间的差异

1 个答案: