Victor Wagner <vitus(at)ice(dot)ru> 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