new-trello-flask/README.md

WITH RECURSIVE hierarcy (id, title, description, parent_id) AS
(
  SELECT id, title, description, parent_id
    FROM items
    WHERE id = 38
  UNION ALL
  SELECT items.id, items.title, items.description, items.parent_id
    FROM hierarcy JOIN items
      ON hierarcy.parent_id = items.id
)
SELECT * FROM hierarcy;

https://www.mysqltutorial.org/mysql-adjacency-list-tree/