ArcGIS is just plain lousy at dealing with any relationship that isn't one-to-one. We all have a slew of hacks just to deal with this limitation. I for one regularly am creating temporary cross-tab queries so I can represent multiple sample results at a collection point, fish surveyed at a cross-section and a host of other relationships. The classic example for mapping comes from the cadastral community and condominium lots. It's an odd situation where more than one person has title to the same piece of ground. How do you represent this? I've got a new trick thanks to Mohammed Hoque's article in ArcUser Magazine. We're going to do a database query inside a label expression, loop through the results and output the entire list to label. For our example we'll use Outfitting Areas in Idaho and we'll label them with the Outfitters and Guide License Numbers and Outfitter Names. 1.) Open ArcGIS and add your spatial layer with the unique identifier shared with...
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