Select * from user where user_id = '*userId*' and access_level = 0 or access_level = 1;

如果查询返回任何行，则它们被允许进入系统。围绕着“access_level = 0或access_level = 1”的括号将实现他们的意图。相反，只要有access_level为1的用户，任何人都可以进入。

I was going to earn my credit with the supervisor for my quite advanced graphics program at a SunOS / Solaris with instant messaging enabled where with zephyr.vars or whatever it was called you could make an image appear on your listed friend's screen like if you alowed me I could just send you an image that appeared on your display. While I was demoing the program I had written so that the supervisor could give me credit for it, one of my friends sitting close or in the next room made the photo big-mama.xxx appear on my screen. There was never any discussion or penalty because of the incident and I got credit for the project that for ½ second seemed like it was programmed to display big-mama.xxx instead of solving the problem. (Earlier) I updated perl scripts and waited for sysadmin to reflect the changes to ouside the FW. Then the database was gone and it was not a bug it was a feature since the data was stored with the source and therefore updating the source blanked the persistence.

物理访问或模拟登录提示或登录屏幕是另外两种困难的情况，不需要过多的算法技术，很容易理解物理访问提供了许多可能性，模拟登录提示是您可以在许多不同类型的计算机和环境上进行的事情。

我们有一个客户要求根据特定的HTTP引用器自动登录。所以你和我必须登录，但如果你点击了一个特定网站的链接，你就会自动以默认用户登录。

从早期的在线商店来看:

在购物车的数量栏输入.1即可获得9折优惠。软件正确地将总成本计算为.1 * cost，人工包装订单只是忽略了包装数量前面的奇数“.”:)

两个系统之间的“统一登录”——这暴露了密码为免费文本.........在url中!!

这是一个“离岸”的政府项目。幸运的是，它很早就被注意到了。可怕的是开发人员并没有看到这么多的问题-真的让你怀疑。

这是很久以前的事了……但DEC的VAX系统过去是随账户一起发货的:

系统登录: 密码:经理

而且 登录:字段 服务密码:

大多数系统管理员都知道SYSTEM帐户，并且大多数(但不是全部)会更改它。然而，并不是所有人都知道FIELD帐户也有SYSTEM特权。