SQL-已将数据分组时的运行总计 [英] SQL - running total when data already grouped

问题描述

我正在尝试对某些数据进行累加运算，并且已经看到了一种简单的方法.但是，我已经对一些数据进行了分组，这使我的代码丢了.我目前有日期和付款类型，以及与之相关的总数.

I am trying to do a running total for some data, and have seen the easy way to do it. However, I have already grouped some data and this is throwing off my code. I currently have dates and payment types, and the totals that it relates to.

我目前所拥有的是:

create table #testdata
(
mdate date,
pmttype varchar(64),
totalpmtamt int
)

insert into #testdata
select getdate()-7, 'DD', 10
union
select getdate() -7, 'SO', 12
union
select getdate()-6, 'DD', 3
union
select getdate()-5, 'DD', 13
union
select getdate()-5, 'SO', 23
union
select getdate()-5, 'PO', 8

我想拥有的是:

mdate       |  paymenttype  |  totalpmtamt  |  incrtotal
2016-08-29  |  DD           |  10           |  10
2016-08-29  |  SO           |  12           |  22
2016-08-30  |  DD           |  3            |  25
2016-08-31  |  DD           |  13           |  38
2016-08-31  |  SO           |  8            |  46
2016-08-31  |  PO           |  23           |  69

我尝试将在这里找到的其他代码改编为:

I've tried adapting other code I've found here into:

select  t1.mdate, 
        t1.pmttype,
        t1.totalpmtamt, 
        SUM(t2.totalpmtamt) as runningsum
     from #testdata t1
join #testdata t2 on t1.mdate >= t2.mdate and t1.pmttype >= t2.pmttype
group by t1.mdate, t1.pmttype, t1.totalpmtamt
order by t1.mdate

但是我得到的只是

mdate       |  paymenttype  |  totalpmtamt  |  incrtotal
2016-08-29  |  DD           |  10           |  10
2016-08-29  |  SO           |  12           |  22
2016-08-30  |  DD           |  3            |  13
2016-08-31  |  DD           |  13           |  26
2016-08-31  |  SO           |  8            |  34
2016-08-31  |  PO           |  23           |  69

任何人都可以帮忙吗?

推荐答案

ANSI进行累计总和的标准方法是:

The ANSI standard way of doing a cumulative sum is:

select t.*, sum(totalpmtamt) over (order by mdate) as runningsum
from #testdata t
order by t.mdate;

并非所有数据库都支持此功能.

Not all databases support this functionality.

如果您的数据库不支持该功能，我将进行相关子查询:

If your database doesn't support that functionality, I would go for a correlated subquery:

select t.*,
       (select sum(t2.totalpmtamt)
        from #testdata t2
        where t2.mdate <= t.mdate
       ) as runningsum
from #testdata
order by t.mdate;

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