Your question doesn't quite provide enough information for me to see the exact reason WHY you need the subquery. If you submit this info I'd be happy to look at it. In the meantime, is there any way around needing the subquery on the join? We've often avoided it by using alias tables, and...
You can opt to display "0" in the data column. Then apply an alerter to the same column which displays the variable if its value is >=0 and also if its value is <0 (ie if a value exists at all).
Cheers - middletj.
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