Mysql：我如何从多个表中获取3列？

Question

我有两张桌子：

论坛：

+-----------+----------------+-----------------+-------------+---------------+
| forum_id  |user_profile_id |profile_forum_id |profile_role |profile_status |
+-----------+----------------+-----------------+-------------+---------------+
|         9 |              7 |               2 | moderator   | active        |
|        10 |              1 |               2 | admin       | active        |
|        40 |              1 |               1 | admin       | active        |
+-----------+----------------+-----------------+-------------+---------------+

DDX：

+----+-----------+-------------+---------------+-----------------+
| id |profile_id |profile_name | DDX_content   |profile_forum_id |
+----+-----------+-------------+---------------+-----------------+
|  2 |         1 | user1       | 874420        |               1 |
|  3 |         1 | user2       | 124500        |               2 |
+----+-----------+-------------+---------------+-----------------+

现在我想获得所有用户的列表（包含3列：profile_name，DDX_content，profile_role），其中包含＆＃39; admin＆＃39;或者＆＃39;主持人＆＃39;特定论坛ID的角色。我怎么能这样做？

Answer 1

select ddx.profile_name, ddx.DDX_content, f.profile_role
from ddx
join forums f on f.user_profile_id = ddx.profile_id
where profile_role in ('admin','moderator')
and forum_id = 123

Answer 2

尝试此请求：

SELECT
    d.profile_name,
    d.DDD_content,
    f.profile_role
FROM
    DDX AS d
    INNER JOIN
        Forums AS f
        ON f.profile_forum_id = d.profile_forum_id
WHERE
    (profile_role = 'admin' OR profile_role = 'moderator')
    AND forum_id = 9;