php - 我怎样才能结合 2 个复杂的 mysql 查询

Question

所以我有两个 MySQL 查询，如果我有知识可以组合，但我没有，所以这就是我转向“SO”的原因，在那种情况下我没有尝试任何东西，因为它超出了我的范围.我想将所有内容合并到一个查询中，如果这不可能，请告诉我。

查询一“这会选择你所有 friend 的帖子，包括你的”:

"SELECT b.*, c.photo, d.name, e.status 
FROM post b 
INNER JOIN profile c 
INNER JOIN user d 
INNER JOIN user_friendship e 
ON b.from_user = c.user_id 
AND b.from_user = d.id 
AND e.friend_id = b.from_user 
WHERE e.status = :status 
AND e.user_id = :id
ORDER BY b.id DESC LIMIT 20"

查询二“这会选择你关注帖子的所有人”:

"SELECT b.*, c.photo, d.name, e.status
FROM post b
INNER JOIN profile c 
INNER JOIN user d 
INNER JOIN user_follower e 
ON b.from_user = c.user_id 
AND b.from_user = d.id 
AND e.to_id = b.from_user 
WHERE e.status = :status 
AND e.who_id = :id
ORDER BY b.id DESC LIMIT 20"

我将这些组合在一起，但只与 php 组合。我想将两者结合在一个 MySQL 查询中。提前致谢

Answer 1

SELECT *
FROM
  (SELECT b.*,
          c.photo,
          d.name,
          e.status
   FROM post b
   INNER JOIN profile c
   INNER JOIN USER d
   INNER JOIN user_friendship e ON b.from_user = c.user_id
   AND b.from_user = d.id
   AND e.friend_id = b.from_user
   WHERE e.status = :status
     AND e.user_id = :id LIMIT 20
   UNION SELECT b.*,
                c.photo,
                d.name,
                e.status
   FROM post b
   INNER JOIN profile c
   INNER JOIN USER d
   INNER JOIN user_follower e ON b.from_user = c.user_id
   AND b.from_user = d.id
   AND e.to_id = b.from_user
   WHERE e.status = :status
     AND e.who_id = :id LIMIT 20 ) MainQuery
ORDER BY id DESC