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Short answer is YES, a dataset can use multiple data sources. One should simply do a full join that includes all records.
The UI only allows selecting existing fields to match them, so you can't use a condition like
1=1
Any help with that would be appreciated.
UPDATE: The matching rule doesn't really matter, FULL JOIN will always include all records from both sides.
UPDATE 2. Jan 2023 However, the result is a double set of columns, even if the two DBs and tables have identical column names."
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