php - MySQL 根据之前的查询选择行

Question

$clicks = mysqli_real_escape_string($conn,$_POST['clicks']);
$modifier = 10*$clicks;

$result = mysqli_query($conn,"SELECT * FROM posts ORDER BY freshness LIMIT $modifier,10");

while($row = mysqli_fetch_assoc($result)){
    $posts[] = $row;
}

$result2 = mysqli_query($conn,"SELECT * FROM comments ORDER BY time WHERE ????");

while($row2 = mysqli_fetch_assoc($result2)){
    $comments[] = $row2;
}

对于 $result2，如何选择 10 个帖子 ID 中每一个的 WHERE(即 $row['id'])来自$结果？否则我会不必要地选择表中的每一条评论。

Answer 1

为什么不在一个查询中完成这一切？

 $modifier = 10*$clicks;

 $query = "SELECT *
    FROM posts 
    INNER JOIN comments
    ON posts.id = comments.post_id
    ORDER BY posts.freshness 
    LIMIT '$modifier'";