前一天或後一天

Insus.NET把它們寫成自定義函數，再程式中直接套用即可。

前一天：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      Insus.NET
-- Create date: 2019-05-15
-- Update date: 2019-05-15
-- Description: 前一天
-- =============================================
CREATE FUNCTION [dbo].[svf_TheDayBefore]
(
    @Date DATETIME
)
RETURNS DATETIME
AS 
BEGIN 
    RETURN DATEADD(d,-1,@Date)
END
GO

後一天：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      Insus.NET
-- Create date: 2019-05-15
-- Update date: 2019-05-15
-- Description: 後一天
-- =============================================
CREATE FUNCTION [dbo].[svf_TheDayAfter]
(
    @Date DATETIME
)
RETURNS DATETIME
AS 
BEGIN 
    RETURN DATEADD(d,1,@Date)
END
GO

如果獲取昨天或明天日期，傳入今天日期進去即可：