MySQL查询将行动态转换为列和总和

Question

Can MySQL convert columns into rows, dynamically adding as many columns as are needed for the rows. I have tried other solutions but they dont seem to solve my unique case. This is the table with the data

Table A

    +---------+-------------+------+
    |driver_id|stage_name   |points|
    +---------+-------------+------+
    |1        |Stage 1 50cc |20    |
    +---------+-------------+------+
    |1        |Stage 2 50cc |17    |
    +---------+-------------+------+
    |2        |Stage 1 50cc |17    |
    +---------+-------------+------+
    |2        |Stage 2 50cc |15    |
    +---------+-------------+------+
    |3        |Stage 1 75cc |17    |
    +---------+-------------+------+
    |3        |Stage 2 75cc |15    |
    +---------+-------------+------+
    |4        |Stage 1 75cc |15    |
    +---------+-------------+------+
    |4        |Stage 2 75cc |20    |
    +---------+-------------+------+

I would like query that formats it as follows

    +---------+-------------+-------------+-------------+-------------+--------------+
    |driver_id|Stage 1 50cc |Stage 2 50cc |Stage 1 75cc |Stage 2 75cc | Total Points |
    +---------+-------------+-------------+-------------+-------------+--------------+
    |1        |     20      |     17      |    null     |    null     |    37        |
    +---------+-------------+-------------+-------------+-------------+--------------+
    |2        |     17      |     15      |    null     |    null     |    32        |
    +---------+-------------+-------------+-------------+-------------+--------------+
    |3        |     null    |     null    |     16      |     15      |    31        |
    +---------+-------------+-------------+-------------+-------------+--------------+
    |4        |     null    |     null    |     15      |    20       |    35        |
    +---------+-------------+-------------+-------------+-------------+--------------+

As you can see the last col has a calculation based on the total of the various stages across for that driver. The sum isnt very important right now but having the scores first but if all is possible then splendid.

Answer 1

I would store the data this way (or possibly a step further in normalisation):

+-----------+----------+----+--------+
| driver_id | stage_no | cc | points |
+-----------+----------+----+--------+
|         1 |        1 | 50 |     20 |
|         1 |        2 | 50 |     17 |
|         2 |        1 | 50 |     17 |
|         2 |        2 | 50 |     15 |
|         3 |        1 | 75 |     17 |
|         3 |        2 | 75 |     15 |
|         4 |        1 | 75 |     15 |
|         4 |        2 | 75 |     20 |
+-----------+----------+----+--------+

Then I would use this query:

SELECT driver_id, stage_no, cc, points FROM my_table ORDER BY driver_id,stage,cc;

Then everything else I would handle in application code.