Its starting to drive me bananas... (sorry, I could not resist)
The problem with storing it using triggers/materialized views is that the "where" clause against the data table is not constant. Sometimes I am searching the data table for records in a state, zip code radius, full-text search (using tsearch2), and about 3 other factors. So the "grouping" has to happen *AFTER* the result set is limited by the WHERE clause against the data table.
.. I hope I explained that well enough...
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