CREATE SplitString FUNCTION IN SQL

/*
use the user define spit function
select * from fnSplitString('a,b,c,d,e',',')
*/
CREATE FUNCTION [dbo].[fnSplitString]  
(  
    @string NVARCHAR(MAX),  
    @delimiter CHAR(1)  
)  
RETURNS @output TABLE(splitdata NVARCHAR(MAX)  
)  
BEGIN  
    DECLARE @start INT, @end INT  
    SELECT @start = 1, @end = CHARINDEX(@delimiter, @string)  
    WHILE @start < LEN(@string) + 1 BEGIN  
        IF @end = 0  
            SET @end = LEN(@string) + 1
       
        INSERT INTO @output (splitdata)  
        VALUES(SUBSTRING(@string, @start, @end - @start))  
        SET @start = @end + 1  
        SET @end = CHARINDEX(@delimiter, @string, @start)
         
    END  
    RETURN
END