Question

我仍然遇到计算运行平衡的最佳方法的问题。

我将在我将要在SSRS中生成的Rent Statement中使用此代码，但我遇到的问题是我似乎无法弄清楚如何实现运行平衡。

    SELECT rt.TransactionId,
       rt.TransactionDate,
       rt.PostingDate,
       rt.AccountId,
       rt.TotalValue,
       rab.ClosingBalance,
       ROW_NUMBER()OVER(PARTITION BY rt.AccountId ORDER BY rt.PostingDate desc) AS row,
       CASE WHEN ROW_NUMBER()OVER(PARTITION BY rt.AccountId ORDER BY rt.PostingDate desc) = 1
            THEN ISNULL(rab.ClosingBalance,0)
            ELSE 0 end

FROM RentTransactions rt
--all accounts for the specific agreement
INNER JOIN (select raa.AccountId
            from RentAgreementEpisode rae
            inner join RentAgreementAccount raa on raa.AgreementEpisodeId = rae.AgreementEpisodeId
            where rae.AgreementId=1981
           ) ij on ij.AccountId = rt.AccountId
LEFT JOIN RentBalance rab on rab.AccountId = rt.AccountId AND rt.PostingDate BETWEEN rab.BalanceFromDate AND isnull(rab.BalanceToDate,dateadd(day, datediff(day, 0, GETDATE()), 0))

这给我的是以下结果 - 我已将结果包括在内 -

所以我的代码按照我想要的顺序对事务进行排序，并且也按照正确的顺序对它们进行行编号。

行号为1 - 我需要它在那个时间点撤回该帐户的余额，这正是我正在做的......但是我不确定如何让我的代码启动减去前一行 - 所以在这种情况下，1118.58的当前数字需要从第2行减去91.65的总值 - 因此第2行的运行余额将是1026.93，依此类推......

非常感谢任何帮助。

Answer 1

假设您在查询中返回了所有事务，您可以使用over子句计算运行总计，您只需从数据集的开头开始，而不是从当前余额向后工作：< / p>

declare @t table(d date,v decimal(10,2));
insert into @t values ('20170101',10),('20170102',20),('20170103',30),('20170104',40),('20170105',50),('20170106',60),('20170107',70),('20170108',80),('20170109',90);

    select *
            ,sum(v) over (order by d
                          rows between unbounded preceding
                                   and current row
                         ) as RunningTotal
    from @t
    order by d desc

输出：

+------------+-------+--------------+
|     d      |   v   | RunningTotal |
+------------+-------+--------------+
| 2017-01-09 | 90.00 |       450.00 |
| 2017-01-08 | 80.00 |       360.00 |
| 2017-01-07 | 70.00 |       280.00 |
| 2017-01-06 | 60.00 |       210.00 |
| 2017-01-05 | 50.00 |       150.00 |
| 2017-01-04 | 40.00 |       100.00 |
| 2017-01-03 | 30.00 |        60.00 |
| 2017-01-02 | 20.00 |        30.00 |
| 2017-01-01 | 10.00 |        10.00 |
+------------+-------+--------------+

运行总计的问题

1 个答案: