Nested Set Model: a way to model nested sets of entities and query them in a SQL database. I haven't used it for anything but it seems fun. https://en.m.wikipe

Nested Set Model: a way to model nested sets of entities and query them in a SQL database. I haven't used it for anything but it seems fun. https://en.m.wikipedia.org/wiki/Nested_set_model https://en.m.wikipedia.org/wiki/Nested_set_model