> > I still don't see it as terrifically useful functionality, given
that it's 
> > just saving you 4 keystrokes ...
> Less than that, because the AS is optional.  The only argument I've
> heard that carries much weight with me is that it eases porting from
> other DBMS's that allow this.  Are there any others besides Oracle?

FWIW IBM implemented this syntax in Informix 11.1 Cheetah released in
July 2007.
They also allow to omit the alias, and it imho makes sense.


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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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