using a variable as xquery sql server 2005

Question

I have a query in sql as following

select  PricingXML.query('/Fields/Field1,/Fields/Field2') from T_SMPricingData 

PricingXML is a xml column in the table T_SMPricingData.

I need to pass the xquery from a variable to the query like the following

declare @var nvarchar(100)
set @var='/Fields/Field1,/Fields/Field2'
select  PricingXML.query('sql:variable("@var")') from T_SMPricingData 

How can I use the variable correctly. It is not working in the intended manner

Edit My output for the original correct query is

<Field1>10</Field1><Field2>11</Field2>
<Field1>20</Field1>

The data in the column looks like

<Fields>
<Field1>20</Field1>
<Field3>22</Field3>
<Field4>23</Field4>
</Fields>

Link for sql fiddle http://www.sqlfiddle.com/#!3/12d7c/6/0

Answer 1

I achieved the above by

DECLARE @var nvarchar(100)
SET @var='/Fields/Field1,/Fields/Field2'
DECLARE @sqlCommand varchar(1000)
SET @sqlCommand = 'SELECT PricingXml.query('''+@var+''') from MyTable'
EXEC (@sqlCommand)