php - mysql选择位置和顺序

我得到了一个积分系统，就像人们可以升级到[PRO1]用户一样。每个人的权限（pro1，pro2，用户）存储在我的mysql用户表中。但是我想作一点提要，以显示最新的提要升级到[PRO1]的提要。升级代码：

 $insert = "UPDATE `users` SET `points` = (`points`-50) WHERE `username` = '".$username."' and points > 50";
mysql_query($insert);
if (mysql_affected_rows() > 0)
{

    // other codes

  $insert =  "UPDATE users SET rights=' [PRO1]' WHERE `username` = '".$username."'";
    mysql_query($insert);
header('location: succesupgrade.php');
}else{
    echo "You don't have enough points";
}


?>

升级代码可以正常工作（以防万一我需要添加时间/日期。此代码中我希望“用户名”不是最后一次升级到[PRO1]的代码）：

    <?php
require("dbc.php");
$query = mysql_query("select * from users WHERE rights='[PRO1]' order by right DESC limit 1") or die(mysql_error());

while($array = mysql_fetch_array($query)) {
    echo "{$array['username']}<br>";
}
?>was the last to upgrade to:
<?php
require("dbc.php");
$query = mysql_query("select * from users WHERE rights='[PRO1]' order by rights DESC limit 1") or die(mysql_error());

while($array = mysql_fetch_array($query)) {
    echo "{$array['rights']}<br>";
}
?>

但是该代码给了我这个错误：You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DESC limit 1' at line 1

最佳答案

在第二个代码块的第一个查询中，order by right必须为order by rights。