Let’s say I have this MySQL table:

+--------------+----+-----------------+------------+
| val_critical | qs | code_critical   | code_line  |
+--------------+----+-----------------+------------+
| 1            | YS | 4.01 - Passers  | GX10-13686 |
| 1            | YS | 3.03 - Chains   | GX10-13686 |
+--------------+----+-----------------+------------+

I would like to get a table with the values rows of code_critical in the columns.

So far I was able to get an output like this:

+------------+----------------+---------------+
|  code_line | 4.01 - Passers | 3.03 - Chains |
+------------+----------------+---------------+
| GX10-13686 |       1        |       0       |
| GX10-13686 |       0        |       1       |
+------------+----------------+---------------+

Instead of

+------------+----------------+---------------+
|  code_line | 4.01 - Passers | 3.03 - Chains |
+------------+----------------+---------------+
| GX10-13686 |       1        |       1       |
+------------+----------------+---------------+

Using this query: SQL Fiddle

I personalized this good answer:
T-SQL Pivot? Possibility of creating table columns from row values