"Josh Berkus" <josh(at)agliodbs(dot)com> writes:
> Until you can upgrade, though, try this approach:
> CREATE VIEW c_aggregate AS
> SELECT sum(a) as sum_a, b FROM c GROUP BY b;
> SELECT max(sum_a) FROM c_aggregate;
Unfortunately that won't work in 7.0 --- grouped views have a lot of
problems in that version, and one of the problems is that you can't
do another level of aggregating on their results.
Basically a view and a subselect are the same thing, so you can't get
around the restrictions of one by using the other...
7.1 is what Sara needs.
regards, tom lane
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