[bioneuralnet]

My first job in the late 2000's was at a small university with a home-grown ERP system originally written in the 80s (Informix-4GL). Student records, employee records, financials, asset tracking - everything. It used natural compound keys.

Even worse than the verbose, repetitive, and error-prone conditions/joins was the few times when something big in the schema changed, requiring a new column be added to the compound key. We'd have to trawl through the codebase and add the new column to every query condition/join that used the compound key. It sucked.