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Identifying dominant categories via another field

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I’m trying to populate a field with a name (category) based on the highest number within the bounds of a specific REGION_ID.

In other words, identifying which ‘CODE’ is dominant for the ‘REGION_ID’ by the largest ‘AREA’ within that ‘REGION_ID’.

I have made a complete example of how it should result (see figure attached) after manually populating the ‘DOMINANT_CODE’ field.

Attachment 33022

I have tried to use the Pivot table and now believe that’s probably not the way to go. Maybe it needs to be done in more than one stage… any help would be much appreciated.
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