MySQL相关 'projects'查询

Question

请考虑以下项目表:

Project:
  table: project
  manyToMany:
    themes:
      targetEntity: Theme
      inversedBy: projects
      joinTable:
        name: project_theme
        joinColumns:
          project_id:
            referencedColumnName: id
        inverseJoinColumns:
          theme_id:
            referencedColumnName: id
    platforms:
      targetEntity: Platform
      joinTable:
        name: project_platform
        joinColumns:
          project_id:
            referencedColumnName: id
        inverseJoinColumns:
          platform_id:
            referencedColumnName: id
  manyToOne:
    client:
      targetEntity: Client

如您所见，一个项目具有三个关系；主题通过 project_theme 连接表，平台通过 project_platform 表，客户端通过 client_id 列。

我正在尝试生成一个查询，该查询将查找所有相关项目 - 具有相同主题、平台或客户的项目 - 并按“分数”对它们进行排序。

例如:

Project A:  Themes: 18, 19  Platforms: 1, 4  Client: 22

Find related projects to Project A..

Project D:  Themes: 18, 19  Platforms: 1, 4  Client: 22Score: 5

Project G:  Themes: 18, 21  Platforms: 3, 4  Client: 22Score: 3

Project B:  Themes: 8, 21  Platforms: 2, 4  Client: 1Score: 1

I'd really appreciate some assistant with writing a MySQL query for this. I've been struggling for a while with the following - but I'm probably miles off:

SELECT 
    `project`.*,
    GROUP_CONCAT(`project_theme`.`theme_id`) as themes,
    GROUP_CONCAT(`project_platform`.`platform_id`) as platforms,
    `project`.`client_id` as client
FROM `project`
LEFT JOIN `project_theme` ON `project`.`id` = `project_theme`.`project_id`
LEFT JOIN `project_platform` ON `project`.`id` = `project_platform`.`project_id`
GROUP BY `project`.`id`

非常感谢您的帮助
皮特

Answer 1

我在平板电脑上，所以我会很简短。将它们视为三个独立的查询并将它们合并。当我有键盘时，我会带着 sql 回来。