我如何结合2复杂的MySQL查询

Question

所以我有两个MySQL查询，如果我有知识结合我会，但我不这样，这就是为什么我转向“所以”，在那种情况下，我没有尝试任何事情，因为它超出了我的范围。我想将所有查询结合在一起，如果这不可能，请告诉我。

查询一个“此选择你的朋友的帖子，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" 

查询两个“这将选择所有的人你下面的帖子”：

"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" 

我已经联合这些，但只有PHP。我想在一个单一的MySQL查询中将两者结合起来。在此先感谢

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 

Answer 2

SELECT b.*, c.photo, d.name, e.status, "P" 
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 
UNION 
SELECT b.*, c.photo, d.name, e.status, "F" 
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 

有了额外的列，你可以看到该行从（P =后，F =以下）

未来记住，工会将消除重复行。如果你想看到所有的行使用UNION ALL