On Tue, 2007-02-06 at 16:54 -0500, Merlin Moncure wrote:
> It would be great to be able to join to update, returning, etc.  It
> looks like the code was deliberately tied off as-is and I was
> surprised not to see a todo for this.
> the basic idea is to be able to do things like:
> select * from (update foo set id = 1 returning *) q;
> which currently syntax errors out on 'set' which is a bit odd.
> here are tom's brief notes on it and also some context on how select
> combined with insert/update might influence triggers:
> http://archives.postgresql.org/pgsql-hackers/2006-10/msg00693.php

Also a relevent thread:


        Jeff Davis

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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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