目录1. 邮箱地址验证2. URL 验证3. 电话号码验证(简单示例)4. 身份证号码验证(中国)5. IP 地址验证6. 空白行检测7. 十六编程客栈进制颜色代码验证8. 邮政编码验证(中国)9. 只包含字母和数字的字符串验证10. 匹
hi i have a table as followsid,school,address,city,state,phone,email,fax . There is almost 40 cities . I need to select 1 entry from each city. can any one guide me