SSMS SQL需要為組的每一行增加一個值

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

我希望它看起來像這樣：-

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

您正在尋找從SQL Server 2012開始在SQL Server中可用的累積總和窗口函數：

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將其合並到update ：

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

您可以使用此查詢來獲得所需的結果：

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

用簡單的英語來說是什么意思： 通過PolicyNumber創建數據組，並為每個組連續保存前面的Value列。 組更改后（PolicyNumber更改），然后重新開始總計。