PG Bug reporting form <noreply@postgresql.org> writes:
> I have a large table which I'm running a query on, grouping on a single
> field, and returning only that 1 field, filtered with a HAVING clause. The
> results that I'm getting back however contain a duplicate entry for one of
> the returned values, which I believe should never be able to happen.
That seems quite weird. What LC_COLLATE/LC_CTYPE settings are you using?
regards, tom lane