declare @cam table (
id int,
cam_xml xml
);
insert into @cam(id, cam_xml)
select 1, '<order-request xmlns="REDACTED" server-name="REDACTED" database-name="REDACTED">
<supply-order id="276502" />
</order-request>';
select id, cam_xml
--,[ServerName] = ord.c.value('@server-name', 'varchar(50)')
from @cam
cross apply cam_xml.nodes('order-request') as ord(c)
where ord.c.value('(supply-order/@id)[1]', 'int') = 276502