SQLite : Select from the end of tree to the top - sqlite

Question

from this awesome answer, now i can implement recursive query properly ,
and here i have another question,
first:
i create a table :
CREATE TABLE tree(
id_tree integer PRIMARY KEY AUTOINCREMENT,
id_boss TEXT,
id_child TEXT,
answ TEXT);
insert some value :
INSERT INTO tree(id_boss,id_child,answ) VALUES('1','2','T');
INSERT INTO tree(id_boss,id_child,answ) VALUES('1','3','F');
INSERT INTO tree(id_boss,id_child,answ) VALUES('2','P1','T');
INSERT INTO tree(id_boss,id_child,answ) VALUES('2','4','F');
INSERT INTO tree(id_boss,id_child,answ) VALUES('3','P2','T');
INSERT INTO tree(id_boss,id_child,answ) VALUES('3','8','F');
and then i running a recursive query from this awesome answer :
WITH RECURSIVE
under_alice(name,level,order_nr) AS (
VALUES('1','0',0)
UNION ALL
SELECT tree.id_child, under_alice.level+1, tree.id_tree
FROM tree, under_alice
WHERE tree.id_boss=under_alice.name
ORDER BY 2 DESC, 3
)
SELECT substr('..........',1,level*3) || name FROM under_alice;
the result will be like this :
1
...2
......P1
......4
...3
......P2
......8
"Edited" ------>
and my question is, is this posible to reverse it,
for example i choose id_child = 'P2', result will be :
P2
3
1
and if i choose id_child = 'P1' :
P1
2
1

Answer 1

The recursive query starts at P1:
VALUES('P1')
In the recursion step, we go from some record (ancestor) to its parent by looking up the id_boss value of that entry:
SELECT tree.id_boss
FROM tree JOIN ancestor ON tree.id_child = ancestor.id
Everything together:
WITH RECURSIVE
ancestor(id) AS (
VALUES('P1')
UNION ALL
SELECT tree.id_boss
FROM tree JOIN ancestor ON tree.id_child = ancestor.id
)
SELECT id FROM ancestor;