邮件使用情况统计方法如下: ) AS domain, COUNT(DISTINCT [column_name]) AS mail_count, COUNT([column_name]) AS mail_sum, AS percent FROM [table_name] WHERE [column_name] LIKE '%@%' GROUP BY domain DISTINCT用来排除重复的邮箱地址,domain是邮箱域名,mail_count是统计某域名下不重复的邮箱地址数量,mail_sum…
mysql left join 右表数据不唯一的情况解决方法 <pre>member 表id username1 fdipzone2 terry member_login_log 表id uid logindate1 1 2015-01-012 2 2015-01-013 1 2015-01-024 2 2015-01-025 2 2015-01-03 select a.id, a.username, b.logindate from member as a left join (select…
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http://www.ijrter.com/papers/volume-2/issue-4/dns-tunneling-detection.pdf <DNS Tunneling Detection>In this paper we have presented a method of the DNS tunneling detection based on the clustering of the DNS traffic images.检测手段也分为两种:DNS packet analysi…
在用StackExchange.Redis这个组件时候,时不时会出现异常TimeOut解决方法如下, 解决方法: 在Program的Main入口方法里添加一句话: System.Threading.ThreadPool.SetMinThreads(, ); 比如以下代码: public class Program { public static void Main(string[] args) { System.Threading.ThreadPool.SetMinThreads(, ); //…