Is it possible to create a calculated field inside of an SQL statement?

For example: Suppose we have the statement,

select temp1.*,nodes.x as x2, nodes.y as y2 ;
	from UPDNETATR!xydata nodes ;
	right outer join temp1 ;
	on  nodes.n = temp1.b;
	where st_name <> ' ' ;
	order by temp1.st_name

the result contains fields x1 and x2. We want to add an additional field (dx) based on dx = abs(x1-x2). Is this possible within the SQL?

Thanks