Hierarchical query in MySQL - mysql

Question

Having that table structure & data:
| ID | PARENT | FIELD_1 | FIELD_2 | RATING |
+------------------------------------------+
| 1 | NULL | F1V1 | F2V1 | 10 |
| 2 | 1 | F1V2 | F2V2 | 20 |
| 3 | 2 | F1V3 | F2V3 | 30 |
| 4 | 3 | F1V4 | F2V4 | 40 |
Is there a way of getting a result like this one:
| ID | F_1 | F_2 | P_F_1 | P_F_2 | G_F_1 | G_F_2 | S_R |
+-------------------------------------------------------------+
| 1 | F1V1 | F2V1 | NULL | NULL | NULL | NULL | 10 |
| 2 | F1V2 | F2V2 | F1V1 | F2V1 | NULL | NULL | 30 |
| 3 | F1V3 | F2V3 | F1V2 | F2V2 | F1V1 | F2V1 | 60 |
| 4 | F1V4 | F2V4 | F1V3 | F2V3 | F1V2 | F2V2 | 90 |
What I actually want, as you can see, is for every record if there are parent (P), grandparent (G), etc records (the recursion may go for 4 levels or any other finite number that is already known), the fields of their ancestors prefixed (that can happen programmatically outside of the query) and a SUM (or any other GROUP function) that calculates the values recursively as well.
ex record #4:
ID = 4
FIELD_1 AS F_1 = F1V4
FIELD_2 AS F_2 = F2V4
PARENT_FIELD_1 AS P_F_1 = F1V3
...
GRANDPARENT_FIELD_2 AS G_F_2 = F2V2
SUM_RATING AS S_M = (40 + 30 + 20) = 90**
NOTE:
Even though record #1 is an ancestor of record #4 (grand-grandparent) its rating is not calculated in the sum because it is not contained in the query.

Answer 1

This simplest way:
SELECT t.id,
t.field_1 f_1,
t.field_2 f_2,
p.field_1 p_f_1,
p.field_2 p_f_2,
g.field_1 g_f_1,
g.field_2 g_f_2,
t.rating + COALESCE(p.rating,0) + COALESCE(g.rating,0) s_r
FROM table_name t
LEFT JOIN table_name p
ON p.id = t.parent
LEFT JOIN table_name g
ON g.id = p.parent
And add left joins, additions and field selections to the known level of recursion.