gdavis@refractions.net (Graham Davis) writes:
> 40 seconds is much too slow for this query to run and I'm assuming
> that the use of an index will make it much faster (as seen when I
> removed the GROUP BY clause). Any tips?
Assumptions are dangerous things.
An aggregate like this has *got to* scan the entire table, and given
that that is the case, an index scan is NOT optimal; a seq scan is.
An index scan is just going to be slower.
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