id | parent_id | path_string| path_identification_string     | depth
---+-----------+------------+--------------------------------+------
87 |         2 | /87/       | countries                      |     2
88 |        87 | /87/88/    | countries/belgium              |     3
89 |        87 | /87/89/    | countries/netherlands          |     3
91 |        89 | /87/89/91/ | countries/netherlands/business |     4
92 |        89 | /87/89/92/ | countries/netherlands/economy  |     4 
90 |        87 | /87/90/    | countries/germany              |     3
Query:
INSERT INTO ezcontentobject_tree(id) VALUES (NULL);
    
SELECT LAST_INSERT_ID();

UPDATE ezcontentobject_tree SET
    parent_node_id = 89, path_string = '/87/89/93/',
    path_identification_string = 'countries/netherlands/food',
    depth = 4
WHERE id = 93;