在MySQL/MariaDB中将来自同一列不同行的两个单元格的数据合并

我在寻找这个问题的答案时遇到了困难，因为我缺乏关于术语和SQL的知识，即使我知道它可能存在

我有一个包含以下表格的数据库：
desc-pkm

+-----------------+---------------+------+-----+---------+-------+
| Field           | Type          | Null | Key | Default | Extra |
+-----------------+---------------+------+-----+---------+-------+
| pkm_code        | int(11)       | NO   | PRI | NULL    |       |
| pkm_name        | varchar(32)   | NO   | UNI | NULL    |       |
| pkm_category    | varchar(32)   | NO   |     | NULL    |       |
| pkm_description | varchar(1280) | NO   |     | NULL    |       |
| pkm_weight      | float         | NO   |     | NULL    |       |
| evolution_code  | int(11)       | YES  | MUL | NULL    |       |
+-----------------+---------------+------+-----+---------+-------+

描述poketype

+---------------------+------------+------+-----+---------+-------+
| Field               | Type       | Null | Key | Default | Extra |
+---------------------+------------+------+-----+---------+-------+
| pkm_code            | int(11)    | NO   | PRI | NULL    |       |
| type_code           | int(11)    | NO   | PRI | NULL    |       |
| poketype_is_primary | tinyint(1) | NO   |     | NULL    |       |
+---------------------+------------+------+-----+---------+-------+

desc型

+-----------+-------------+------+-----+---------+-------+
| Field     | Type        | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| type_code | int(11)     | NO   | PRI | NULL    |       |
| type_name | varchar(32) | NO   | UNI | NULL    |       |
+-----------+-------------+------+-----+---------+-------+

到目前为止，我有以下SQL命令：

SELECT pkm.pkm_code, pkm.pkm_name,type.type_name FROM poketype
    JOIN pkm ON pkm.pkm_code=poketype.pkm_code
    JOIN type ON poketype.type_code=type.type_code
    WHERE pkm.pkm_code<=151
    ORDER BY pkm_code;

预期结果：

+-----------+-------------+-------------+
| pkm_code  | pkm_name    | type_name   |
+-----------+-------------+-------------+
| 1         | Bulbasaur   | grass,poison|

（是的，bulbasaur是一种双重类型。我也很惊讶！）

使用mysql将来自不同记录的值组合成一个值：

SELECT pkm.pkm_code, pkm.pkm_name, group_concat(type.type_name) as typename FROM poketype
    JOIN pkm ON pkm.pkm_code=poketype.pkm_code
    JOIN type ON poketype.type_code=type.type_code
    WHERE pkm.pkm_code<=151
    GROUP BY pkm.pkm_code, pkm.pkm_name;

从poketype中选择pkm.pkm_代码、pkm.pkm_名称、group_concat（type.type_名称）作为typename
在pkm.pkm_code=poketype.pkm_code上加入pkm
poketype.type\u code=type.type\u code上的联接类型
其中pkm.pkm_代码编辑您的问题，并提供示例数据和所需结果。抱歉，这不起作用。它包含列中的所有内容，我只是
poketype
中的单元格，其中
pkm_code
与所包含的单元格相同。我认为您错过了group by子句。它在我回答的问题的最后一行。
SELECT pkm.pkm_code, pkm.pkm_name, group_concat(type.type_name) as typename FROM poketype
    JOIN pkm ON pkm.pkm_code=poketype.pkm_code
    JOIN type ON poketype.type_code=type.type_code
    WHERE pkm.pkm_code<=151
    GROUP BY pkm.pkm_code, pkm.pkm_name;