I came across this post recently, and realized that I, too, was one of the many who have been doing GIS for years without realizing that this option existed. What a clever trick for working with one to many relationships.
https://esriaustraliatechblog.wordpress.com/2015/06/22/spatial-joins-hidden-trick-or-how-to-transfer-attribute-values-in-a-one-to-many-relationship/
Ha! Never knew that. I knew about the field mapping but never played with the merge rule, very useful indeed, thanks for highlighting it.
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