Victor Wagner <[EMAIL PROTECTED]> writes:
> As far as I understand, following three queries are exactly equivalent:

Same results, but the second two constrain the planner's choice of join
order.  See

http://www.ca.postgresql.org/users-lounge/docs/7.2/postgres/explicit-joins.html

Whether this is a feature or a bug depends on context...

                        regards, tom lane

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