Mysql子查詢顛倒順序

Question

我有這段代碼，它不工作。我想用最新的評論進行查詢後將訂單逆轉。

SELECT * 
FROM( 
    SELECT users.id, users.nome, users.email,users.foto, comments.content 
    FROM users, comments 
    WHERE comments.posts_id=? AND comments.users_id=users.id 
    ORDER BY comments.id DESC LIMIT 5) 
AS dummy 
ORDER BY comments.timecomment ASC 

Answer 1

看起來你只是需要給你的外部查詢一些東西（cid）來排序，然後做你現在正在做的事情;

SELECT * 
FROM (SELECT users.id, users.nome, users.email,users.foto, 
      comments.content, comments.id cid 
     FROM users, comments 
     WHERE comments.posts_id=1 AND comments.users_id=users.id 
     ORDER BY comments.id DESC LIMIT 5) AS dummy 
ORDER BY cid ASC 

Answer 2

如果你的目標只是輸出發現意見扭轉它在PHP：

SELECT users.id, users.nome, users.email,users.foto, comments.content 
    FROM users, comments 
    WHERE comments.posts_id=? AND comments.users_id=users.id 
    ORDER BY comments.id DESC LIMIT 5 

$評論= array_reverse（$意見）;

Answer 3

要排序，comments.timecomment領域，似乎並沒有在內部SELECT查詢中選擇......此外，明確提到的表名可能無法在如果該字段外部查詢是必要的名字是唯一的。

如何：

SELECT * 
FROM( 
    SELECT users.id, users.nome, users.email,users.foto, comments.content, 
    comments.timecomment 
    FROM users, comments 
    WHERE comments.posts_id=? AND comments.users_id=users.id 
    ORDER BY comments.id DESC LIMIT 5) 
AS dummy 
ORDER BY timecomment ASC