MYSQL LEFT JOIN 3 个表包含 NULL 集

Question

试图对其他 SO 用户的问题/答案进行“逆向工程”，但没有成功。 JOINS 仍然让我望而却步。

我有三个表:race(所有比赛的列表)、result(每场比赛的结果)、driver(车手信息)。并非所有车手都参加过特定赛道的所有比赛。

比赛台

| race_id   | track_id   | year   | complete |
+-----------+------------+--------+----------+
| 1         | 1          | 2006   | 1        |
| ...       | ...        | ...    | ...      |
| 21        | 1          | 2007   | 1        |
| ...       | ...        | ...    | ...      |
| 135       | 1          | 2008   | 1        |
| ...       | ...        | ...    | ...      |
| 215       | 1          | 2009   | 1        |
| ...       | ...        | ...    | ...      |
| 292       | 1          | 2010   | 1        |
| ...       | ...        | ...    |...       |
| 351       | 1          | 2011   | 0        |
+-----------+------------+--------+----------+

结果表

| race_id | driver_id | finish |
+---------+-----------+--------+
| 135     | 1         | 15     |
| ...     | ...       | ...    |
| 292     | 1         | 6      |
+---------+-----------+--------+

驱动表

| driver_id | name       |
+-----------+------------+
| 1         | Joe Driver |
+-----------+------------+

我想要一个显示的结果集:

| name       | race_id |  year  | finish |
+------------+---------+--------+--------+
| Joe Driver | 21      | 2007   | NULL   |
| Joe Driver | 135     | 2008   | 15     |
| Joe Driver | 215     | 2009   | NULL   |
| Joe Driver | 292     | 2010   | 6      |
+------------+---------+--------+--------+

Joe Driver 仅参加了 2006 年之后 track_id = 1 的 4 场比赛中的 2 场，并且仅包括完整的比赛 (1)

这是我当前的查询:

SELECT driver.driver, race.id, race.year, result.finish
FROM race
LEFT JOIN result ON race.id = result.race_id
LEFT JOIN driver ON result.driver_id = driver.driver_id
WHERE race.track_id = 1
AND race.year > 2006
AND race.complete = 1
AND driver.driver_id = 1
ORDER BY race.id ASC

我得到的结果只显示车手参加的比赛:

| name       | race_id |  year  | finish |
+------------+---------+--------+--------+
| Joe Driver | 135     | 2008   | 15     |
| Joe Driver | 292     | 2010   | 6      |
+------------+---------+--------+--------+

我确定我忽略了 JOINS 的简单规则？

谢谢!

Answer 1

SELECT  driver.driver, race.id, race.year, result.finish
FROM    race
CROSS JOIN
        driver
LEFT JOIN
        result
ON      result.race_id = race.id
        AND result.driver_id = driver.driver_id
WHERE   race.track_id = 1
        AND race.year > 2006
        AND race.complete = 1
        AND driver.driver_id = 1
ORDER BY
        race.id ASC