小编Chr*_*ris的帖子

我有一个选择和查询如下...

    $sql = "SELECT * 
        FROM notifications 
        WHERE to_id='".$userid."' 
            AND (alert_read != '1' OR user_read != '1') 
        ORDER BY alert_time DESC";
    $result = mysql_query($sql);

如何测试查询运行的时间？