mysql-将逗号分隔的列表拆分为整数列表

我试图实现的是从help\u ref获取帮助id

到目前为止，iv'e所做的工作：

question:

+-----------+-------------------------+
|question id|          help_ref       |
+-----------+-------------------------+
|     1     |      1001,1002,1004     |
+-----------+-------------------------+
|     2     |      1005,1002,1001     |
+-----------+-------------------------
help:

+--------------------+
|help_id|  text      |
+--------------------+
| 1001 | sjfdisfidif |
+--------------------+
| 1002 |  dfdjdjdjjd |
+--------------------+
| 1003 | blafdsjdidjd|
+--------------------+
| 1004 | somethibngjd|
+--------------------+

那么，如何将10011002值更改为实际的help\u ref字符串呢

预期结果：

SELECT *
FROM questions AS a
JOIN `help` AS b on find_in_set(b.`help_id`,a.`help_ref`) >0
WHERE b.`help_id` IN (1001,1002) // IM TRYING TO CHANGE THAT TO THE help_ref value
AND `question_id` = 1

我想你想要这个：

SELECT *
FROM questions AS a
JOIN `help` AS b on find_in_set(b.`help_id`,a.`help_ref`) >0
WHERE b.`help_id` IN (a.`help_ref`)
AND `question_id` = 1

help_id | text
1001    | sjfdisfidif
1002    | dfdjdjdjjd
1004    | somethibngjd

---

你能给我们看看你的预期结果吗？编辑，谢谢@D-Shih

SELECT h.*
FROM help h
INNER JOIN question q
    ON FIND_IN_SET(h.help_id, q.help_ref) > 0 AND q.question_id = 1;