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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
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
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
hust 1347 - Reverse Number
题目描述Given a non-negative integer sequence A with length N, you can exchange two adjacent numbers each time. After K exchanging operations, what’s the ...
分类:其他好文   时间:2014-06-22 23:36:42    阅读次数:232
[转]Virtualization Basics
Virtualization Basics Virtualization is not a new concept, but its complexity has been growing, and a number of new paradigms are rising. I will try t...
分类:其他好文   时间:2014-06-21 18:08:03    阅读次数:336
[LeetCode] Plus One
Given a non-negative number represented as an array of digits, plus one to the number.The digits are stored such that the most significant digit is at...
分类:其他好文   时间:2014-06-20 14:43:53    阅读次数:137
第一届
A(Phone Number)1.暴力 #include #include #include #include #include using namespace std;int cmp(const void *a,const void *b){ return strcmp((char *)a...
分类:其他好文   时间:2014-06-20 14:41:04    阅读次数:139
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