如何在 SSRS 中获取某行的前一个值

Question

我的 SSRS 报告有两个组（帐户、月份）。 Account 是 Parent，Month 是子组。现在我想将每个月的期末余额显示为下个月的期初余额。下面给出了示例报告。红色字体表示每组的总和。请记住，我试图通过使用 SSRS Previous() 函数来获取结果，但无法获得预期的结果。

Previous(Sum(Fields!NetAmt.Value),"Month")

月 => 月组名称。

谁能帮帮我？

提前致谢。

发怒

样本SQL数据

CREATE TABLE [dbo].[Balances](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [Account] [nvarchar](50) NULL,
    [Month] [date] NULL,
    [BegBalance] [float] NULL,
    [Debit] [float] NULL,
    [Credit] [float] NULL,
    [EndBalance] [float] NULL,
 CONSTRAINT [PK_Balances] PRIMARY KEY CLUSTERED 
(
    [id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET IDENTITY_INSERT [dbo].[Balances] ON
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (1, N'Cash', CAST(0xDB3A0B00 AS Date), 0, 100, 50, 50)
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (2, N'Cash', CAST(0xDB3A0B00 AS Date), 0, 200, 50, 150)
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (3, N'Cash', CAST(0xFA3A0B00 AS Date), 0, 200, 50, 150)
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (4, N'Cash', CAST(0xFA3A0B00 AS Date), 0, 200, 100, 100)
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (5, N'Mr.  Axxx', CAST(0xDB3A0B00 AS Date), 0, 200, 100, 100)
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (6, N'Mr.  Axxx', CAST(0xDB3A0B00 AS Date), 0, 100, 50, 50)
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (7, N'Mr.  Axxx', CAST(0xFA3A0B00 AS Date), 0, 100, 50, 50)
INSERT [dbo].[Balances] ([id], [Account], [Month], [BegBalance], [Debit], [Credit], [EndBalance]) VALUES (8, N'Mr.  Axxx', CAST(0xFA3A0B00 AS Date), 0, 100, 20, 80)
SET IDENTITY_INSERT [dbo].[Balances] OFF

使用 Previous() 函数后

Answer 1

您可以在数据集的 SQL 查询中处理它，尝试使用 LAG():

SELECT mt.*, beg.begbal FROM [dbo].[Balances] mt
JOIN
(
SELECT [Account]
      ,[Month]
      ,SUM([EndBalance]) EndBal
      ,LAG (SUM([EndBalance]), 1, 0) OVER (PARTITION BY [Account] ORDER BY [Month] ASC) begbal
  FROM [dbo].[Balances]
  GROUP BY [Account]
      ,[Month]
) beg
ON mt.Month = beg.Month
AND mt.Account = beg.Account

更新： 不使用 LAG()，尝试下面的代码。

WITH CTE AS
(
SELECT [Account]
      ,[Month]
      ,SUM([EndBalance]) EndBal
      ,ROW_NUMBER() OVER (PARTITION BY [Account] ORDER BY [Month] ASC) RowVal
  FROM [dbo].[Balances]
  GROUP BY [Account]
      ,[Month]
)

SELECT mt.*, ISNULL(t2.EndBal, 0) as begbal FROM CTE t1
LEFT JOIN CTE t2
ON t1.Account = t2.Account AND t1.RowVal = t2.RowVal + 1
JOIN [dbo].[Balances] mt
ON t1.Month = mt.Month AND t1.Account = mt.Account

另外，下面是您要查找的SSRS表达式代码：

=IIF
(
(RunningValue(Fields!Month.Value, CountDistinct, "Account")) = 1,
0,
Previous(SUM(Fields!EndBalance.Value),"MonthGrp")
)

Answer 2

您可以使用 LOOKUPSET 函数和自定义代码来获取之前的 End Balance 总数。

转到 Report 菜单/Code 选项卡中的 Report properties... 粘贴此 VB 函数。

Public Function GetBegBal(values As Object) As String
    Dim total As Double = 0
    For Each value As Double In values
                      total = total + value
        Next
    Return total
End Function

在Beg Balance中使用这个表达式：

=Code.GetBegBal(
LOOKUPSET(
Fields!Account.Value & "-" & MONTH(Fields!Month.Value)-1,
Fields!Account.Value & "-" & MONTH(Fields!Month.Value),
Fields!EndBalance.Value,
"DataSetName")
)

将 DataSetName 替换为您的真实姓名，然后预览您的报告，它应该如下所示：

请注意，我在“月份”列中使用了 MONTHNAME 函数，因此它 returns 月份名称基于我机器中的区域和语言设置（西班牙语）。

如果有帮助请告诉我。

如何在 SSRS 中获取某行的前一个值

How to get the previous value of a row in SSRS

sql-server

reporting-services

ssrs-2008-r2

ssrs-2012