mysql检查是否喜欢帖子

Question

我有三个表（喜欢），（帖子）和（用户），并且在我的程序中我按用户ID获取帖子，而这样做我想要返回，如果我喜欢的帖子与否，我试着去做像这样

$query="SELECT post , users.name, users.profile_pic , users.uid , posts.likes , posts.comments , posts.createdAt , posts.pid, 
            IF('$uid' IN (SELECT uid FROM likes WHERE uid='$uid' AND pid=this.posts.pid), 1, 0) AS i_liked
            FROM posts
            INNER JOIN users
            ON users.uid = posts.uid
            WHERE posts.uid = '$uid' OR posts.uid 
            IN (SELECT users.uid
                FROM friends
                INNER JOIN users
                ON users.uid=friends.ruid OR users.uid=friends.luid
                WHERE accept=1 AND (friends.luid='$uid' OR friends.ruid='$uid') AND users.uid!='$uid')

            ORDER BY posts.createdAt DESC
            LIMIT $loaded_posts, 20";

但它显示“pid = this.posts.pid”

时出错

Answer 1

您需要使用this.posts.pid更改posts.pid。