Question

以下是50％佣金和50美元上限的发票报表数据样本。我正在使用SQL Server 2008.我认为我需要的是一个总计的cap列来产生我需要的结果。以下是一些示例数据：

account|amount|transdate          |commission|cap
123456 |50    |2017-01-01 00:00:00|25        |25
123456 |50    |2017-02-02 00:00:00|25        |25
123456 |100   |2017-03-03 00:00:00|50        |50

这是我想看到的：

account|amount|transdate          |commission|cap|running_total
123456 |50    |2017-01-01 00:00:00|25        |25 |25
123456 |50    |2017-02-02 00:00:00|25        |25 |50
123456 |100   |2017-03-03 00:00:00|50        |50 |0

所以在2/2/17我已经达到50美元的上限，并且在3/3/17我不能长时间收集这个账户，因此金额将为0.

Here's an demo of my data

select account,
amount,
transdate,
coalesce(amount*.5, 0) as commission,
(case when coalesce(amount*.5, 0)>=50 then 50 else coalesce(amount*.5, 0) end) as cap
from #invoice

感谢我能得到的任何帮助。

Answer 1

一种方法是使用相关子查询来计算运行总计。我在下面的CTE中进行此计算，并且我报告在最终输出中运行总计，但总数小于上限，否则报告为零。

WITH cte1 AS (
    SELECT
        account,
        amount,
        transdate,
        COALESCE(amount*0.5, 0) AS commission,
        CASE WHEN COALESCE(amount*0.5, 0) >= 50
             THEN 50 ELSE COALESCE(amount*0.5, 0) END AS cap
    FROM #invoice
),
cte2 AS (
    SELECT *,
        (SELECT SUM(t2.cap) FROM cte1 t2
           WHERE t2.transdate <= t1.transdate) AS running_total
    FROM cte1 t1
)
SELECT
    t.account,
    t.amount,
    t.transdate,
    t.commission,
    t.cap,
    CASE WHEN t.running_total > 50 THEN 0 ELSE t.running_total END AS running_total
FROM cte2 t

以上限

1 个答案: