索引视图：如何使用索引视图将值插入其他 table？

Question

我的table:

CREATE TABLE [dbo].[Balance] (
    [Id]             INT             IDENTITY (1, 1) NOT NULL,    
    [Balance]        DECIMAL (18, 2) NOT NULL,
    [Today_Date]     AS              (CONVERT([char](10),getdate(),(126))),
    [Date_end]       DATE            NOT NULL,
    [Remaining_Days] AS              (datediff(day,CONVERT([char](10),getdate(),(126)),[Date_end])),
    [In_Months]      AS              (datediff(day,CONVERT([char](10),getdate(),(126)),[Date_end]))/(30),
    [Amount_Monthly] AS              CAST((case when ((datediff(day,CONVERT([char](10),getdate(),(126)),[Date_end]))/30) = 0 then NULL else [Balance]/((datediff(day,CONVERT([char](10),getdate(),(126)),[Date_end]))/30) end) as DECIMAL(18,2)),
    PRIMARY KEY CLUSTERED ([Id] ASC)
);

长什么样：

我希望它自动将Amount_Monthly插入到一个新的table中，所以它看起来像这样：

例如如果它说 In_Months = 2 它应该填写一月和二月的 Balance_monthly 到 7058,82。我想让它自动计算就像我让它根据输入自动计算remaining_days。

谢谢！

Answer 1

您需要 12 行，每行代表一个从 1 到 12 的月份。为此，我在 CTE 中使用了一个简单的 union all 查询，但您可能已经有 table 个数字可供使用。然后加入月份数小于或等于 [in_Month] 列的位置。该连接现在会自动将 table 的行乘以所需的月数。

;with m12 as (
  select 1 as mn
  union all      select 2      union all      select 3      union all      select 4
  union all      select 5      union all      select 6      union all      select 7
  union all      select 8      union all      select 9      union all      select 10
  union all      select 11     union all      select 12
 )
select
        row_number() over(order by b.id, m12.mn) as [ID]
      , datename(month,dateadd(month,m12.mn - 1,0)) as [Month]
      , b.Amount_Monthly as Balance_Monthly
from Balance b
inner join m12 on m12.mn <= b.in_months

参见：http://sqlfiddle.com/#!6/4fc6f/3

请注意，您可能希望将 db.balance.id 作为 [balanceid] 或类似内容包含在新的 table 中，以便您可以追溯到源行 ID。

如果 CTE 是一个问题，只需使用 "derived table" 代替，例如

select
        row_number() over(order by b.id, m12.mn) as [ID]
      , datename(month,dateadd(month,m12.mn - 1,0)) as [Month]
      , b.Amount_Monthly as Balance_Monthly
from Balance b
inner join (
              select 1 as mn
              union all      select 2      union all      select 3      union all      select 4
              union all      select 5      union all      select 6      union all      select 7
              union all      select 8      union all      select 9      union all      select 10
              union all      select 11     union all      select 12
           ) as m12 on m12.mn <= b.in_months

Answer 2

今天的日期新的结束日期剩余天数每日 2015-11 2015-12 2016-01 2016-02 2016-03 2016-04 2016-05 2016-06 2016-07 2016-08 2016-09 2016-10 2016 -11 2016-12 11/30/2015 12/31/2015 1/31/2016 2/28/2016 3/31/2016 4/30/2016 5/31/2016 6/30/2016 7/31/2016 8/31/2016 9/30/2016 10/31/2016 11/30/2016 12/31/2016 10/29/2015 1/4/2016 67 $210.71 $6,321.33 $6,532.04 $842.84 $- $- $- $- $- $- $- $- $- $- $-
10/29/2015 1/8/2016 71 $283.24 $8,497.16 $8,780.40 $2,265.91 $- $- $- $- $- $- $- $- $- $- $-

应该是这样的

Answer 3

@马赫什所以，@Usedbyalready 的回答似乎有点矫枉过正，我尝试自己在更新中使用 case 来制作它并且它完美地工作。

UPDATE Months
SET Months.Balance_monthly = 
    CASE 
        WHEN Balance.In_Months > 1 THEN Amount_Monthly          
    END
FROM Balance
JOIN Months 
ON Months.Id <= Balance.In_Months;

我还制作了一个触发器，自动将值插入我的月份 table:

CREATE TRIGGER [Balance_monthly]
ON [dbo].[Balance]
FOR INSERT, UPDATE
AS
BEGIN
    SET NOCOUNT ON

    UPDATE Months
    SET Months.Balance_monthly = 
    ((Balance.In_Months + 12 - Months.Id) / 12) * Amount_Monthly          
    FROM Balance
    CROSS JOIN Months;


END

Answer 4

此处金额未正确拆分，例如，如果余额中的剩余天数如果今天日期为 2015-12-16 且结束日期为 2016-01-31，则剩余天数可能为 46 天，此处金额需要拆分为十二月，即当前月份和一月，谁能告诉我如何实现它

索引视图：如何使用索引视图将值插入其他 table？

Indexed views: How to insert value into other table with index views?

sql

sql-server

indexing

triggers

indexed-views