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Re: full outer join performance

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Ben <bench@xxxxxxxxxxxxxxx> writes:
> Are full outer joins expected to perform much worse than inner joins? 

You're getting burnt by the outer join forcing a bad join order.
There's some related discussion here:
http://www.postgresql.org/docs/8.0/static/explicit-joins.html

			regards, tom lane

---------------------------(end of broadcast)---------------------------
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
       match

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