CREATE FUNCTION NumberMask (@InputNumber int)
RETURNS char(2)
AS
BEGIN
DECLARE @InputString varchar(2)
DECLARE @OutputString char(2)
SELECT @InputString=CONVERT(varchar(2), @InputNumber)
IF LEN(@InputString) < 2
BEGIN
SET @OutputString = REPLICATE(\'0\', 2-LEN(@InputString)) + @InputString
END
ELSE
SET @OutputString = @InputString
RETURN @OutputString