使用PHP从sql表中获取最小值

Question

我想从使用PHP的条件匹配的SQL表中获取最小/最小ID，我尝试了以下代码但是发生了错误，即

  

尝试在第14行的/var/www/html/site/sitename/project-name.php中获取非对象的属性

任何建议都受到高度赞赏，而不是

$query = "select MIN(id) FROM project_view WHERE project_id = '$projectId' and email = '$email_in_cookie'";
$result = $con->query($query);
if( $result->num_rows > 0 )
{
     $row = $result->fetch_assoc();
     $sectionID = $row['id'];
}
echo $sectionID;