forum_idparent_idleft_idright_idforum_parentsforum_nameforum_descforum_rules 1 0 1 6 Parent with two flat children 2 1 2 3 Flat child #1 3 1 4 5 Flat child #2 4 0 7 12 Parent with two nested children 5 4 8 11 Nested child #1 6 5 9 10 Nested child #2 7 0 13 22 Parent with flat and nested children 8 7 14 15 Mixed child #1 9 7 16 19 Mixed child #2 10 9 17 18 Nested child #1 of Mixed child #2 11 7 20 21 Mixed child #3