Hmmm... the only way I can see this is possible (i.e. with the use of accumulate) is to use transient facts:- This can be set-up with a decision table quite easily (and ValuedRegion can be a declarative type that extends Region adding the "value" field) rule "setup ValuedRegions - using a decision table"     when         $Region( $score : score )     then         insertLogical( new ValuedRegion( $score, [a value] ) ); end Your rule rule "Calculate Value"    when        $c : Company()        $r : Region()        $val : Double() from accumulate (ValuedRegion($score : score, $value : value ) , sum($score * $value))    then        // Do Something end On 10 April 2012 14:51, Davout <davout1805(a)gmail.com&gt; wrote: > > Hello, > > I'm trying to figure out how I can use a Decision Table as a lookup table. > I > did come across > http://drools.46999.n3.nabble.com/Rules-with-Lookup-Tables-td56996.html > however, it asking about using a database. > > Typical Senario: > Where [value from lookup table] is the value retrieved from the Decision > Table. The reason I'm looking at a Decision Table rather than using a > database is because the number of conditions needs to be changeable by end > users. > > rule "Calculate Value" >    when >        $c : Company() >        $r : Region() >        $val : Double() >            from accumulate (Region($score : score) , sum($score * [value > from lookup table])) >    then >        // Do Something > end > > Thanks. > > -- > View this message in context: > http://drools.46999.n3.nabble.com/Using-Decision-Tables-as-Lookup-Tables-... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users