Re: [HACKERS] Enhancing PGSQL to be compatible with Informix SQL

Bruce Momjian <pgman@candle.pha.pa.us>

From: Bruce Momjian <pgman@candle.pha.pa.us>
To: The Hermit Hacker <scrappy@hub.org>
Cc: Don Baccus <dhogaza@pacifier.com>, Rod Chamberlin <rod@querix.com>, pgsql-hackers@postgresql.org
Date: 2000-01-06T19:16:30Z
Lists: pgsql-hackers
> > Yes, OUTER is an Informix-ism.  Oracle uses *=.  I think the first is
> > easier to add and makes more sense for us.  *= could be defined by
> > someone as an operator, and overloading our already complex operator
> > code to do *= for OUTER may be too complex for people to understand.
> > 
> > It would be:
> > 
> > 	SELECT *
> > 	FROM tab1, OUTER tab2
> > 	WHERE tab1.col1 = tab2.col2
> 
> What about >2 table joins?  Wish I had my book here, but I though tyou
> could do multiple OUTER joins, no?

 	SELECT *
 	FROM tab1, OUTER tab2, OUTER tab3
 	WHERE tab1.col1 = tab2.col2 AND
	      tab1.col3 = tab3.col3


My assumption is that you can't join tab2 to tab3 becaue tab2 is already
outer, but I don't know.

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