I Was Confused About Merise for Weeks. Here's Everything I Learned

Merise is a French database design methodology from the 1970s-80s that structures database design in three levels: MCD (conceptual model with entities and relationships), MLD (logical model with tables, keys, and foreign keys), and MPD (physical implementation). The article explains cardinality rules, entity-relationship mapping, and the conversion process from MCD to MLD, including how N:N relationships become junction tables.