Thanks for your answers, with AggregateTable it can probably do what I would want to do, unfortunately I'm on version 7.5. I want to know whether there is a signal for a company. If I would build a query I would create an aggregated table with company_id and the sum of signals and another query to check if the signal=>1 then 1 else 0 for each company. Instead of creating a new datasource I would want to do it in an expression. If I can't use aggregatetable, is there another way?
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