> I guess it could be useful to define an aggregate taking "SummaryStats" type 
> in
> input so you could do something like:
> 
> SELECT (ST_SummaryStatsAgg(ST_SummaryStats(xx))).* FROM myrast;

Try this:

http://trac.osgeo.org/postgis/browser/trunk/raster/scripts/plpgsql/st_summarystatsagg.sql

...exactly like strk wrote it.

Pierre
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