Question

所以我需要来自2个表格的信息，但是我的JOIN Mysqli不起作用，有人能告诉我这是什么问题吗？：/ 我是INNER JOIN的新手，所以我可能理解错误了x_x

 if($stream = $mysqli->prepare("SELECT $title.message_id, $title.message, $title.likes, $title.dislikes, $title.poster, $title.date, $title.closed user.rank, user.posts, user.reputation FROM  $title INNER JOIN User ON $title.poster = user.username ORDER BY message_id ASC")){
                                    $stream->execute();
                                        $stream->bind_result($message_id, $message, $likes, $dislikes, $poster, $date, $closed, $rank, $posts, $rep, $usnm);

                                        while($stream->fetch()){

Answer 1

您确定$title已定义吗？你确定user有大写吗？

SELECT *
FROM $title
INNER JOIN user
ON $title.poster = user.username
ORDER BY message_id ASC;

Answer 2

您似乎错过了列之间的逗号：$title.closed<needs comma here> user.rank

Answer 3

首先，你有一个失踪的昏迷：

$title.closed user.rank

并且，在您的查询中，表“user”应该用作“User”，并在内部联接中声明大写字母。内连接是错误的。

您应该始终通过联接表开始内连接条件：

WRONG

FROM  $title INNER JOIN User ON $title.poster = user.username

GOOD

FROM  $title INNER JOIN User ON User.username = $title.poster

为什么我的JOIN mysql不起作用？

3 个答案: