判断数字是否为奇数或偶数

判断数字是否为奇数或偶数，可以参考下面2个自定义函数：

奇数：

 
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      Insus.NET
-- Blog:        https://insus.cnblogs.com
-- Create date: 2019-06-02
-- Update date: 2019-06-02
-- Description: 是否为奇数
-- =============================================
 CREATE FUNCTION [dbo].[svf_IsOdd]
 (
    @number INT
 )
 RETURNS BIT
 AS
 BEGIN    
    RETURN CASE WHEN @number % 2 <> 0 THEN 1 ELSE 0 END
 END
 GO

偶数：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      Insus.NET
-- Blog:        https://insus.cnblogs.com
-- Create date: 2019-06-02
-- Update date: 2019-06-02
-- Description: 是否为偶数
-- =============================================
 CREATE FUNCTION [dbo].[svf_IsEven]
 (
    @number INT
 )
 RETURNS BIT
 AS
 BEGIN    
    RETURN CASE WHEN @number % 2 = 0 THEN 1 ELSE 0 END
 END
 GO

举例说明：

;WITH Digits AS
(
    SELECT 0 AS digit
    UNION ALL
    SELECT digit + 1 FROM Digits where digit < 9
)
SELECT [digit],[dbo].[svf_IsEven]([digit]) AS [even],[dbo].[svf_IsOdd]([digit]) AS [odd] FROM Digits

运行结果：