Many time i stucked with business requirements which says we need to send multiple parameters to database, so the first thing came to my head is to send a comma separated parameter and send this parameter to a t-sql tabler function and query on the values that come out from this function which was tooooooooooooo slowwwwwwwww

while ago i had this conversation with one of my colleges and he proposed X-Path which i tried it, and it was more slow and very pad performance, and another one suggested using OPENXML (http://msdn.microsoft.com/en-us/library/aa276847(SQL.80).aspx)

OPENXML provides a rowset view over an XML document. Because OPENXML is a rowset provider, OPENXML can be used in Transact-SQL statements in which rowset providers such as a table, view, or the OPENROWSET function can appear.

DECLARE @idoc int
DECLARE @doc varchar(1000)
SET @doc ='
<ROOT>
<Customer CustomerID="VINET" ContactName="Paul Henriot">
   <Order CustomerID="VINET" EmployeeID="5" OrderDate="1996-07-04T00:00:00">
      <OrderDetail OrderID="10248" ProductID="11" Quantity="12"/>
      <OrderDetail OrderID="10248" ProductID="42" Quantity="10"/>
   </Order>
</Customer>
<Customer CustomerID="LILAS" ContactName="Carlos Gonzlez">
   <Order CustomerID="LILAS" EmployeeID="3" OrderDate="1996-08-16T00:00:00">
      <OrderDetail OrderID="10283" ProductID="72" Quantity="3"/>
   </Order>
</Customer>
</ROOT>'
--Create an internal representation of the XML document.
EXEC sp_xml_preparedocument @idoc OUTPUT, @doc
-- Execute a SELECT statement that uses the OPENXML rowset provider.
SELECT    *
FROM       OPENXML (@idoc, '/ROOT/Customer',1)
            WITH (CustomerID  varchar(10),
                  ContactName varchar(20))

Here is the result set:

CustomerID ContactName          
---------- -------------------- 
VINET      Paul Henriot
LILAS      Carlos Gonzlez

If the same SELECT statement is executed with flags set to 2, indicating element-centric mapping, the

values of CustomerID and ContactName for both of the customers in the XML document are returned as NULL, because the <Customers> elements do not have any subelements.

Here is the result set:

CustomerID ContactName
---------- -----------
NULL       NULL
NULL       NULL