Sara,
Hey! Great to see that Postgres has made it to Israel. What's the
most popular Linux distribution there?
I think you have your answer ... an upgrade. RPMs for most major
distributions of Linux should be available within the week.
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;
Not as fast or dynamic as a subselect, but should solve your immediate
problem.
-Josh Berkus
______AGLIO DATABASE SOLUTIONS___________________________ Josh Berkus Complete
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