On Fri, Jan 14, 2005 at 03:11:32PM -0800, Dann Corbit wrote: > A cardinality estimate function might be nice. > SELECT cardinality_estimate(table_name) > If it is off by 25% then no big deal. > It would be useful for the PostgreSQL query planner also, I imagine. If that's all you want, what about the row estimate from pg_class? It has the number of rows active at last vacuum... For really large tables I imagine it'd be easily close enough... Hope this helps, -- Martijn van Oosterhout <kleptog@xxxxxxxxx> http://svana.org/kleptog/ > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a > tool for doing 5% of the work and then sitting around waiting for someone > else to do the other 95% so you can sue them.
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