SQL:将两个查询合并为一个查询

I have the following two queries:

我有以下两个问题:

    Select count(project.id) as num_project , 
           industry.name as industry_name 
    from   project, project_industry, industry 
    where  industry.id= project_industry.industry_id and 
           project.id = project_industry.project_id  
    group by industry.id;

Select count(user.id) as num_consultants , 
       industry.name as industry_name 
from   consultant_profile, industry_experience,user, industry 
where  industry_experience.consultant_profile_id = consultant_profile.id
       and industry_experience.industry_id= industry.id 
       and user.type=0 
       and user.is_active=1 
       and consultant_profile.user_id=user.id 
group by industry_id;

And I was trying to combine them together into a single one as following:

我试着把它们合并成一个单一的，如下所示

SELECT i.name AS industry_name, num_projects, num_consultants
FROM   industry i
JOIN   (SELECT   pc.industry_id, COUNT(p.id) AS num_projects
        FROM     project p
        JOIN     project_industry pc ON p.id = pc.project_id
        GROUP BY pc.industry_id) x ON x.industry_id = i.id
JOIN   (SELECT   y.industry_id, COUNT(u.id) AS num_consultants
        FROM     user u, consultant_profile cp
        JOIN     project_experience pe on pe.consultant_profile_id = cp.id
        WHERE    u.is_active = 1 AND u.type = 0
        GROUP BY y.industry_id) z ON z.industry_id = i.id;

But it doesn't seem to work. Could anybody point out what I am doing wrong? Any help is much appreciated.

但这似乎行不通。有人能指出我做错了什么吗?非常感谢您的帮助。

EDIT: To make it clear the first query displays the number of project related to each industry. The second query displays the number of consultants related to each industry.

编辑:要明确，第一个查询将显示与每个行业相关的项目数量。第二个查询显示与每个行业相关的顾问数量。

I want the third query to display the information from the first two queries in the same table on 3 separate columns: Industry Name, #Projects, #Consultants

我希望第三个查询在同一个表中显示来自前两个查询的信息，分别列为:行业名称、#Projects、#Consultants

The table structures is as following, where -> describes the primary and foreign keys of the tables:

表结构如下，其中->描述了表的主键和外键:

Project -> project.id
Project_industry -> project_industry.id, project_id, industry_id
Industry -> industry.id

user -> user.id
Consultant_profile -> consultant_profile.id, user_id
Industry_Experience -> industry_experience.id, consultant_profile_id, industry_id
Industry -> industry.id

1 个解决方案

#1

You were almost there.As per my understanding below query should work for you .

你几乎是那里。根据我的理解，下面的查询应该适合您。

QUERY

查询

select T1.industry_name ,num_project ,num_consultants  from 
( Select count(project.id) as num_project , industry.name as industry_name ,industry.id as id  from project, project_industry, industry where industry.id= project_industry.industry_id and project.id = project_industry.project_id  group by industry.id ) T1 
JOIN 
 ( Select count(user.id) as num_consultants , industry.name as industry_name,industry.id as id from consultant_profile, industry_experience,user, industry where industry_experience.consultant_profile_id = consultant_profile.id and industry_experience.industry_id= industry.id and user.type=0 and user.is_active=1 and consultant_profile.user_id=user.id group by industry_id ) T2 
ON T1.id = T2.id