title: What is USING keyword in SQL Server 2008?
body: <p>I know the beautiful usage of the SQL clause "USING": it is similar to NATURAL JOIN but you must detail the join columns; you can join more simply (and faster) the tables that have the same key and foreign key, and the output of queries doesn't contain redundant fields.</p>
  
  <p>However SQL Server 2008 doesn't support the JOIN with the USING keyword, but, as you can see in the <a href="http://msdn.microsoft.com/en-us/library/ms189822%28v=sql.100%29.aspx" rel="nofollow">link</a>, it uses this keyword. Why?</p>