我有以下查询我试图在2个条件下加入2个表('Industry','Country'),但它给了我以下错误
错误代码:1054。'on clause'
中的未知列'i.id'
有谁知道我应该怎么解决这个问题?
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;
编辑表结构如下:
答案 0 :(得分:1)
既然你还没有提供任何sql小提琴 你可以从我的那个开始:
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
如果您将一些数据添加到该小提琴中,我们可以更深入地讨论