SQL Server-按期在行上拆分金额

Question

我想将发票数据金额转换为每月的实际费用。有什么建议吗？

我有一张这样的桌子：

InvoiceID   INVOICE_DATE               AMOUNT   SplitOnNumberOfMonthToCome
-----------------------------------------------------------------------------
23          2019-12-05 00:00:00.000    3000         3
24          2019-12-07 00:00:00.000    2000         1
25          2020-03-12 00:00:00.000    12000        3
26          2020-03-03 00:00:00.000    5000         1

并想要这个：

InvoiceID   MonthPeriod    Amount
---------------------------------------
23          202001         1000
23          202002         1000
23          202003         1000
24          202001         2000
25          202004         4000
25          202005         4000
25          202006         4000
26          202004         5000

Answer 1

您可以使用递归CTE。如果我理解正确：

with cte as (
      select invoiceid, invoice_date, amount / num_months as month_amount, 1 as n, num_months
      from t
      union all
      select invoiceid, invoice_date, month_amount, n + 1, num_months
      from cte
      where n < num_months
     )
select inoiceid,
       format(dateadd(month, n, invoice_date), 'yyyymm') as monthperiod,
       month_amount
from cte;