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sql 分组后 组内排名
语法:ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN)简单的说row_number()从1开始,为每一条分组记录返回一个数字,这里的ROW_NUMBER() OVER (ORDER BY xlh DESC) 是先把xlh列降序,再为降序以后...
分类:数据库   时间:2014-06-28 18:08:45    阅读次数:574
设计模式总结(3)
设计模式总结(3)==========================================singleton pattern单件模式:确保一个类只有一个实例,并提供一个全局访问点。线程安全:同步getInstance方法:public synchronized static Single...
分类:其他好文   时间:2014-06-28 16:31:15    阅读次数:299
PatentTips - Apparatus and method for a generic, extensible and efficient data manager for virtual peripheral component interconnect devices (VPCIDs)
BACKGROUNDA single physical platform may be segregated into a plurality of virtual networks. Here, the physical platform incorporates at least one vir...
分类:移动开发   时间:2014-06-28 14:46:39    阅读次数:330
LeetCode: Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single ...
分类:其他好文   时间:2014-06-28 14:31:12    阅读次数:201
Leetcode: Single Number II
Given an array of integers, every element appears three times except for one. Find that single one.Note:Your algorithm should have a linear runtime co...
分类:其他好文   时间:2014-06-28 13:44:09    阅读次数:188
python学习笔记
1.if语句(python中没有switch语句,可用if……elif……else代替)格式: if 表达式: #语句 else: #语句eg:number = 23guess = int(raw_input('Enter an integer:'))if guess == numb...
分类:编程语言   时间:2014-06-28 11:35:24    阅读次数:253
SQL 相关
SET STATISTICS TIME ON记录查询的相关数据生成随机GuidSELECT NewID()按照某一列排序并生成序号select Row_Number() OVER (ORDER BY Name) [Index] ,Name,ID ,NewID() RandomCod...
分类:数据库   时间:2014-06-28 11:05:19    阅读次数:266
9、ns-3内核
在官方文档ns-3-manual.pdf中,整个框架图:v 随机变量伪随机生成器pseudo-random number generator (PRNG)。默认情况下,ns-3仿真程序使用固定种子和运行数字,它们分别存在全局变量g_rngSeed 和 g_rngRun中,在ns-3.14版本以后,n...
分类:其他好文   时间:2014-06-28 11:01:09    阅读次数:364
Part4 – OPENVSWITCH – Playing with Bonding on Openvswitch
Bonding is aggregation multiple links to single link in order to increase throughput and achieve redundancy in case one of links fails. At least, offi...
分类:其他好文   时间:2014-06-24 10:28:42    阅读次数:211
eclipse重的自动提示与行号和快捷图标的显示
显示行号:Window->Preferences->Gerenal->Editors->Text Editors然后在show line number上打对勾自动提示:Window->Preferences->java->Editor->Cintent Assist->Auto activation...
分类:系统相关   时间:2014-06-24 09:00:40    阅读次数:309
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