[rules-users] Fusion: Group By

Hi, I was wondering how you can achieve a "group by" like this select tickDataFeed, stddev(price) from StockTickEvent(symbol='IBM').win:length(10) where volume > 1000 group by tickDataFeed having stddev(price) > 0.8 I thought of using accumulate or collect, but I'm not sure of the exact syntax. What I tried up to now rule "test" when $event : CountEvent() over window:time( 15s ) from entry-point "Stream" $grouped : Integer() from accumulate (CountEvent($c1:count), count($c1)) then ... But that doesn't work. Any hints? Best regards, Andi -- GMX DSL: Internet-, Telefon- und Handy-Flat ab 19,99 EUR/mtl. Bis zu 150 EUR Startguthaben inklusive! http://portal.gmx.net/de/go/dsl