SET ANSI_NULLS ON
GO
 
SET QUOTED_IDENTIFIER ON
GO
 
-- =============================================
-- Author:      Insus.NET
-- Create date: 2019-05-14
-- Update date: 2019-05-14
-- Description: 过滤所有非数字的字符
CREATE FUNCTION [dbo].[svf_DigitalOnly] ( 
    @OriginalString NVARCHAR(MAX)
)
RETURNS NVARCHAR(MAX)
AS
BEGIN
    DECLARE @tStr NVARCHAR(MAX) = N'', @I INT = 1
    WHILE @I <= LEN(@OriginalString) 
    BEGIN 
        SET @tStr = @tStr + CASE WHEN SUBSTRING(@OriginalString, @I, 1) LIKE '[0-9]' THEN SUBSTRING(@OriginalString, @I, 1) ELSE N'' END 
   
        SET @I = @I + 1 
    END
 
    RETURN @tStr
END
GO