Update 'README.md'

3 years ago · b85fa26c6a
parent b41c4148be
commit b85fa26c6a
1 changed files with 3 additions and 1 deletions
--- a/README.md
+++ b/README.md
@ -10,4 +10,6 @@ WITH RECURSIVE hierarcy (id, title, description, parent_id) AS
      ON hierarcy.parent_id = items.id
 )
 SELECT * FROM hierarcy;
-```
+```
+
+https://www.mysqltutorial.org/mysql-adjacency-list-tree/