Question

我有下表：-

policy number   transaction date   value      running total
123             26/01/2015         1000.00    0
123             13/02/2017         3000.00    0
234             14/02/2014          500.00    0
234             14/02/2016         4500.00    0
234             23/06/2018         1200.00    0
345             17/07/2017         7000.00    0

我希望它看起来像这样：-

policy number   transaction date   value      running total
123             26/01/2015         1000.00    1000.00
123             13/02/2017         3000.00    4000.00
234             14/02/2014          500.00     500.00
234             14/02/2016         4500.00    5000.00
234             23/06/2018         1200.00    6200.00
345             17/07/2017         7000.00    7000.00

Answer 1

您正在寻找从SQL Server 2012开始在SQL Server中可用的累积总和窗口函数：

select f.*,
       sum(f.value) over (partition by f.policy_number order by f.transaction_date) as running_total
from following f;

您可以使用可更新的CTE将其合并到update中：

with toupdate as (
      select f.*,
             sum(f.value) over (partition by f.policy_number order by f.transaction_date) as new_running_total
      from following f
     )
update toupdate
    set running_total = new_running_total;

Answer 2

您可以使用此查询来获得所需的结果：

select 
    PolicyNumber, 
    TransactionDate, 
    [Value],
    RunningTotal = SUM([Value]) OVER (PARTITION BY PolicyNumber 
                                      order by (PolicyNumber) 
                                      rows unbounded preceding) 
from [dbo].[Q51340534]

这用简单的英语来说是什么意思：通过PolicyNumber创建数据组，并为每个组保留前Value列的运行总计。组更改后（PolicyNumber更改），然后重新开始总计。

SSMS SQL需要为组的每一行增加一个值

2 个答案: