上个月的余额到当月的期初余额

Question

我有一个查询返回按月分组的总余额（借方贷方）。有4列;

1. ID
2. 月
3. 期末余额
4. 期初余额

我想要做的是让上个月的平衡值到当月的期初余额值。例如;假设2月份的期末余额为100.000 $美元。那么3月份的开盘价也必须是100.000美元。

对不起造型。我对此很不好。这里是示例数据。

我想在三月的OPEN_BALANCE细胞-14.830.707,59值。

Answer 1

如果没有表架构，例如数据，或期望的结果......事情是这样的：

使用common table expression和outer apply()

;with cte (
    select 
     Id 
    , MonthDate = dateadd(month, datediff(month, 0, [Date]), 0) /* date datatype */ 
    , ClosingBalance = sum(debit)-sum(credit) 
    from t 
    group by 
     Id 
    , dateadd(month, datediff(month, 0, [Date]), 0) 
) 
select 
    Id 
    , MonthDate 
    , Month = datename(month, MonthDate) 
    , ClosingBalance 
    , OpeningBalance = x.OpeningBalance 
from cte 
    outer apply (
    select top 1 
     OpeningBalance = i.ClosingBalance 
    from cte as i 
    where i.Id = cte.Id 
     and i.MonthDate < cte.MonthDate 
    order by i.MonthDate desc 
) as x 

使用与row_number()一个common table expression和left join：

;with cte (
    select 
     Id 
    , MonthDate = dateadd(month, datediff(month, 0, [Date]), 0) /* date datatype */ 
    , ClosingBalance = sum(debit)-sum(credit) 
    , rn = row_number() over (
     partition by Id 
     order by dateadd(month, datediff(month, 0, [Date]), 0) 
     ) 
    from t 
    group by 
     Id 
    , dateadd(month, datediff(month, 0, [Date]), 0) 
) 
select 
    cte.Id 
    , cte.MonthDate 
    , Month = datename(month, cte.MonthDate) 
    , cte.ClosingBalance 
    , OpeningBalance = i.ClosingBalance 
from cte 
    left join cte as x 
    on x.Id = cte.Id 
     and x.rn = cte.rn-1