我正在尝试从Sales表中记录两个基于月份的参数。它没有获得所选择的确切月份，而是激发了我所有的记录。我怎么能去做呢？
当我在一个WHERE子句中包含Monat列时，我得到一个空结果
我的sp：
CREATE PROC [dbo].[spMonthInfo]
(
@Periode1 NVARCHAR (255),
@Periode2 NVARCHAR (255)
)
AS
BEGIN
DECLARE @Dynamictbl nvarchar(MAX) =
N'SELECT
[t].[Monat], [t].[Project],[t].[Description],
[t].[Finance], --[t].[Project] AS [Entrance],
SUM(CASE WHEN [t].Monat = ' + @Periode1 + ' THEN [t].[Amount1] END) AS [Amount1Feb],
SUM(CASE WHEN [t].Monat = ' + @Periode2 + ' THEN [t].[Amount1] END) AS [Amount1March],
SUM(CASE WHEN [t].Monat = ' + @Periode1 + ' THEN [t].[Amount2] END) AS [Amount2Feb],
SUM(CASE WHEN [t].Monat = ' + @Periode2 + ' THEN [t].[ Amount2] END) AS [Amount2March],
FROM [dbo].[tblSales]
GROUP BY [t].[Monat],[t].[Project],[t].[Description],
[t].[Finance], --[t].[Project] AS [Entrance],
EXECUTE sp_executesql @Dynamictbl
END
GO
--
EXEC spMonthInfo @Periode1 = '02.2011', @Periode2 = '03.2011'
问题：image
