I have 2 MapInfo tables that have a corresponding unique ID number field. I'd like to be able to manually select some objects from one table and join the 2 tables based on a matching unique ID number for the selected objects only.
Is this possible?
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Yes, this is possible.
You do it like regular SQL, but use the MapInfo user interface.
Here's an example: http://web.pb.com/mapinfopro-sep-2012/Query-Ninja-Joining-Tables
And here's an image showing how (from the above URL).
In order to achieve the result you're after, try these steps: