PHP MYSQL 查询按类别排序

Question

我有以下问题:

SELECT projects.project_name, files.file_name
FROM `projects` JOIN `files` ON (projects.project_id = files.project_id)
ORDER BY projects.project_name ASC, files.file_name ASC

例如输出:

Project1 - file1
Project1 - file2
Project2 - file3
Project2 - file4

在 PHP 中，我使用以下方法提取这些值:

while ($row = mysql_fetch_assoc($result)) {}

不知怎么的，我想要这样的输出:

Project1 - file1, file2
Project2 - file3, file4

我该怎么做？谢谢。

Answer 1

您可以直接在 MySQL 中使用 GROUP_CONCAT()

SELECT  projects.project_name, 
        GROUP_CONCAT(files.file_name) file_name
FROM    projects
        INNER JOIN files 
            ON (projects.project_id = files.project_id)
GROUP   BY projects.project_name
ORDER   BY projects.project_name ASC, 
           files.file_name ASC

• MySQL GROUP_CONCAT()