I started writing a long post on how to design correct ERD diagrams based on the approach from “Database Design Book”, but the text got a bit unwieldy. So I’m going to regroup and focus on one part: many-to-many relationships (“M:N links” in book terms). Suppose that you need to build an ERD diagram based on some sort of real-world or teaching task. How do you make sure that your ERD diagram is correct?| kb.databasedesignbook.com