/***************************************
* FUNCTION f_onlyNumbers
*
* elimina tutti i caratteri alfabetici dalal stringa
*
* Steamware, S.E.L.
* mod: 2010.03.19
*
****************************************/
CREATE FUNCTION [dbo].[f_onlyNumbers] (@string NVARCHAR(255))
RETURNS NVARCHAR(255) AS  
BEGIN

	DECLARE @answ NVARCHAR(255)
	-- sostituisco TUTTE le lettere dell'alfabeto
	SET	@answ = (SELECT REPLACE(@string, 'a', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'b', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'c', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'd', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'e', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'f', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'g', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'h', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'i', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'j', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'k', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'l', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'm', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'n', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'o', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'p', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'q', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'r', ''))
	SET	@answ = (SELECT REPLACE(@answ, 's', ''))
	SET	@answ = (SELECT REPLACE(@answ, 't', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'u', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'v', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'w', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'x', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'y', ''))
	SET	@answ = (SELECT REPLACE(@answ, 'z', ''))
	
	RETURN @answ

END