MySQL的：加入多個表

我有以下查詢我想2個條件參加2個表（「產業」，‘國家’），但它給了我下面的錯誤MySQL的：加入多個表

錯誤代碼：1054 'on條款'中未知列'i.id'

有沒有人知道我應該如何解決這個問題？

SELECT c.name AS country_name, i.name as industry_name, num_projects, num_consultants, admin_rating 
    FROM industry i, country c 
    JOIN (SELECT pc.country_id, pi.industry_id, COUNT(p.id) AS num_projects 
      FROM  project p, project_country pc, project_industry pi 
      where p.id = pc.project_id and pi.project_id=p.id 
      GROUP BY pc.country_id,pi.industry_id) x ON x.country_id = c.id and x.industry_id=i.id 
    JOIN (SELECT u.country_id,ie.industry_id, COUNT(u.id) AS num_consultants 
      FROM  user u, consultant_profile, industry_experience ie 
      WHERE u.is_active = 1 AND u.type = 0 and 
        ie.consultant_profile_id= consultant_profile.id 
        and u.id= consultant_profile.id 
      GROUP BY u.country_id,ie.industry_id) y ON y.country_id = c.id and y.industry_id = i.id order by num_projects DESC limit 20;

編輯表結構如下：

行業 - ID
project_industry - industry_id，PROJECT_ID
industry_experience - consultant_profile_id，industry_id
consultant_profile - ID邀請，USER_ID

來源

2016-04-28 Marc Zaharescu

'工業'表有'id'列嗎？ – Sadikhasan

你有沒有在行業表 – Mujahidh

列名叫ID？你可以請張貼你的行業表列嗎？ – Mujahidh

既然你還沒有提供任何SQL小提琴你可以從我的一個開始：

http://sqlfiddle.com/#!9/6c0569/1

SELECT pc.country_id, pi.industry_id, 
    COUNT(p.id) AS num_projects, 
    COUNT(u.id) AS num_consultants 
    FROM project p 
INNER JOIN project_country pc 
ON p.id = pc.project_id 
INNER JOIN project_industry pi 
ON pi.project_id=p.id 
INNER JOIN `user` u 
ON u.is_active = 1 AND u.type = 0 
    and u.country_id = pc.country_id 
INNER JOIN industry_experience ie 
ON u.id = ie.consultant_profile_id 
    AND ie.industry_id = pi.industry_id 
GROUP BY pc.country_id, pi.industry_id

，如果你將添加一些數據轉換成小提琴我們可以更深入地討論

來源

2016-04-28 16:28:52 Alex

MySQL的：加入多個表

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