我如何結合2複雜的MySQL查詢

Question

所以我有兩個MySQL查詢，如果我有知識結合我會，但我不這樣，這就是爲什麼我轉向「所以」，在那種情況下，我沒有嘗試任何事情，因爲它超出了我的範圍。我想將所有查詢結合在一起，如果這不可能，請告訴我。

查詢一個「此選擇你的朋友的帖子，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" 

查詢兩個「這將選擇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" 

我已經聯合這些，但只有PHP。我想在一個單一的MySQL查詢中將兩者結合起來。在此先感謝

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 

有了額外的列，你可以看到該行從（P =後，F =以下）

未來記住，工會將消除重複行。如果你想看到所有的行使用UNION ALL