Add 'README.md'

README.md

@@ -0,0 +1,13 @@
+```sql
+WITH RECURSIVE parent_path (id, title, description, path) AS
+(
+  SELECT id, title, description, title as path
+    FROM items
+    WHERE parent_id IS NULL
+  UNION ALL
+  SELECT i.id, i.title, i.description, CONCAT(ip.path, ' > ', i.title)
+    FROM parent_path AS ip JOIN items AS i
+      ON ip.id = i.parent_id
+)
+SELECT * FROM parent_path WHERE id = 38;
+```