183. Customers Who Never Order Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything. Table: Customers. +----+-------+ | Id | Name | +----+-------+ | 1 |…
今天在看<PHP与MySQL程序设计(第四版)>(ISBN: 9787115253521)的时候,183页,如下图: 尝试:$file = fopen("F:\Books\投行笔记.txt","R"); 报警告: Warning: fopen(F:\Books\投行笔记.txt): failed to open stream: No error in D:\Apache24x64\htdocs\Test.php on line 383 实际上就是打开失败…
虽然在Linux里传播的病毒不多,但也是存在一些,我从一些安全网站搜集了一些资料. 1.病毒名称: Linux.Slapper.Worm 类别: 蠕虫 病毒资料: 感染系统:Linux 不受影响系统:Windows 3.x, Windows 95, Windows 98, Windows NT, Windows 2000, Windows XP, Windows Me, Macintosh 病毒传播: port:80, 443, 2002 感染目标:各版本号Linux系统上的Apache Web…