Todd and I talk today aobut primary keys. We focus only on that field, talking about how it is named, its purpose, its use, its type, and even how it's applied to integrations. Our goal is not to provide the definitive answer, but to add to the discussion and to relay years of thinking and practice around this topic. For every FileMaker developer, primary keys are good to revisit every once in awhile to refine our understanding of and use of in our relationship schema.