mysql - sql 没有显示正确的结果

Question

我在 mySql 中有以下表格。

博客

Field       Type         
----------  ------------ 
id          int(11)
name        varchar(255)
user_id     int(11)
share       int(14)

user_blog_analytics

Field        Type        
-----------  ------------
id           int(11)
blog_id      int(11)
ip           varchar(255)
impressions  int(11)
date         date

user_profile

Field        Type        
-----------  ------------
id           int(11)
user_id      int(11)
description  text
share        int(14)

user_profile_analytics

Field        Type        
-----------  ------------
id           int(11)
user_id      int(11)
ip           varchar(255)
impressions  int(11)
date         date

用户

Field        Type        
-----------  ------------
id           int(11)
email        varchar(255)

我想要一个查询，从 blog 表中获取每个用户的博客总份额，从 user_profile 表中获取每个用户的个人资料总份额，昨天的博客总浏览量，即来自 user_blog_analytics 表，来自 user_profile_analytics 表的个人资料的所有时间 View 。

我创建了一个查询，但没有给我预期的结果，它只给我很少的结果。

SELECT a.user_id, COUNT(DISTINCT b.ip) AS blog_view_count, a.share AS blog_share_count, c.share AS profile_share_count, COUNT(DISTINCT d.ip) AS user_profile_view
FROM blog AS a
JOIN user_blog_analytics AS b ON b.blog_id=a.id
JOIN user_profile AS c ON c.user_id=a.user_id
JOIN user_profile_analytics AS d ON d.user_id=c.user_id
JOIN users AS e ON e.id=a.user_id
WHERE DATE_SUB(CURDATE(), INTERVAL 1 DAY) = b.date AND e.role_id=2
GROUP BY a.id;

当我运行这个查询时，它只给我一个结果，但是当我手动检查表格时，它应该至少给我 2 个结果。告诉我哪里错了，我怎样才能通过修改这个查询得到结果。

Answer 1

试试这个:

SELECT u.id, u.email, b.blog_share_count, b.blog_view_count, 
       up.profile_share_count, upa.user_profile_view
FROM users u 
LEFT JOIN (SELECT b.user_id, SUM(b.share) AS blog_share_count, COUNT(DISTINCT b.ip) AS blog_view_count
           FROM blog b 
           LEFT JOIN user_blog_analytics AS uba ON uba.blog_id = b.id AND DATE_SUB(CURDATE(), INTERVAL 1 DAY) = uba.date
           GROUP BY b.user_id
         ) b ON u.id = b.user_id
LEFT JOIN (SELECT up.user_id, SUM(up.share) AS profile_share_count 
           FROM user_profile up 
           GROUP BY up.user_id
         ) up ON u.id = up.user_id
LEFT JOIN (SELECT up.user_id, COUNT(DISTINCT up.ip) AS user_profile_view 
           FROM user_profile_analytics up 
           GROUP BY up.user_id
         ) upa ON u.id = upa.user_id