CREATE FUNCTION [dbo].[svf_SplitStringToSingleCharacter](
  @DataSource NVARCHAR(4000)
)
RETURNS NVARCHAR(4000)
AS
BEGIN
   DECLARE @rtvResult NVARCHAR(4000),@length INT       
 
   SET @length = lEN(ISNULL(@DataSource,'')) 
   
   IF @length = 0
      SET @rtvResult = N''
   ELSE
   BEGIN
        WHILE @length > 0
        BEGIN
            SET @rtvResult = ISNULL(@rtvResult + ',',N'') + '''' + SUBSTRING(@DataSource,@length,1) + ''''
            SET @length = @length - 1
        END
   END
     
   RETURN @rtvResult
END

CREATE FUNCTION [dbo].[svf_SplitStringToSingleCharacter1](
  @DataSource NVARCHAR(4000)
)
RETURNS NVARCHAR(4000)
AS
BEGIN
   DECLARE @rtvResult NVARCHAR(4000),@length INT       
 
   SET @length = lEN(ISNULL(@DataSource,'')) 
   
   IF @length = 0
      SET @rtvResult = N''
   ELSE
   BEGIN
        DECLARE @i INT = 1
        WHILE @i <= @length
        BEGIN
            SET @rtvResult =  ISNULL(@rtvResult + ',',N'') + ''''  +  SUBSTRING(@DataSource,1,1) + ''''
            SET @DataSource = STUFF(@DataSource,1,1,N'')
            SET @i = @i + 1
        END
   END
     
   RETURN @rtvResult
END
GO