Systematic design of multi-join GROUP BY queries

Author: Alexey Makhotkin squadette@gmail.com , ~5400 words. &#xA; &#xA; This is the first public revision of this text. Early readers have&#xA;shared encouraging feedback, but I’m sure there’s still room for&#xA;improvement. I’m releasing it now to gather broader input from a&#xA;wider audience. &#xA; &#xA; Update (2025-06-08) : I wrote a prequel to this text: &ldquo;Multi-join&#xA;queries design:…