Logical Operator "&" instead of using IN

				let us suppose that we have a Web Page where we can look for customers by countryes. The web page gives as the chance to choose several countryes at the same time. We have multiple checkboxes with the name of the options (not only one).
let's create the table to star this example

CREATE TABLE [customers] (
	[idreg] [int] IDENTITY (1, 1) NOT NULL ,
	[countryid] [int] NULL ,
	[data] [char] (10) 
) ON [PRIMARY]
GO
Now we can insert some data

INSERT INTO customers(countryid, data) values
 (2,'customer1')

INSERT INTO customers(countryid, data) values 
(8,'customer2')

INSERT INTO customers(countryid, data) values 
(8,'customer3')

INSERT INTO customers(countryid, data) values 
(16,'customer4')

INSERT INTO customers(countryid, data) values 
(16,'customer5')

INSERT INTO customers(countryid, data) values 
(32,'customer6')

INSERT INTO customers(countryid, data) values 
(32,'customer7')

GO

We need to obtain for example the customers of
 the country 8 and 32 (8+32=40)
SELECT * 

FROM customers

WHERE (countryid & 40 )>0

...and the customers from the contryes 16,32 and 2
(16+32+2=50)

SELECT * 

FROM customers

WHERE (countryid & 50 )>0

in other way we used to do something like this

SELECT * 

FROM customers

WHERE countryid IN (16,32,2)

The advantage of using "&" operator is that we
 only have one parameter to look for 
multiple values. We only have to sum the values of the countryid.
The county id must be values like (2,4,8,32,64,128,256...)
I hope you like that...and sorry for my english!!!