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Oracle随机获取记录
1 SELECT A.* FROM TableA A CROSS JOIN (SELECT TRUNC(DBMS_RANDOM.VALUE(0, 999999999999999999999)) RANDOMNUM FROM DUAL) B ORDER BY B.RANDOMNUM
分类:数据库   时间:2014-05-26 23:25:36    阅读次数:217
ORACLE随机查询
1.select * from (select * from tablename order by dbms_random.value) where rownum< N;注:dbms_random是一个可以生成随机数值或者字符串的程序包。value()是最常用的,value()的用法一般有两个种,第...
分类:数据库   时间:2014-05-23 07:12:52    阅读次数:364
快速排序
1 #include 2 //quickSort 3 int partition(int a[],int start,int end) { 4 int node = a[start]; //初始节点 5 while(start= node && end > start) ...
分类:其他好文   时间:2014-05-23 04:04:22    阅读次数:304
sqlserver分页查询
SQL Server 2005引入的新方法。SELECT * FROM (SELECT ROW_NUMBER() OVER(ORDER BY keyField DESC) AS rowNum, * FROM tableName) AS t WHERE rowNum > start AND rowNu...
分类:数据库   时间:2014-05-22 14:22:58    阅读次数:351
性能测试结果分析
Definitions:?StressTests the server –Peak volume over a short span of time?LoadTests the database –Largest load the database can handle at one time?Vo...
分类:其他好文   时间:2014-05-22 01:29:01    阅读次数:338
second order system analysis 自控 二阶系统的稳定性分析 matlab multisim仿真分析
second order system anlysis 在matlab里面搭建好相应的仿真模型图 当T0 = 10 ,K1 = 1,T1 = 1的时候 根据二阶系统的开,闭环传递函数的特点,这里我们可以通过调节系数的值,间接的调节Wn 和 epsilon(阻尼)的值 在上图中epsilon...
分类:其他好文   时间:2014-05-21 16:35:01    阅读次数:271
TI C66x DSP硬件信号量 - 2
The semaphore module can be used as an arbiter to ensure mutual exclusivity when sharing resources over multiple cores in a multicore device. It provides up to 64 independent semaphores that can be ac...
分类:其他好文   时间:2014-05-21 16:26:59    阅读次数:234
Third order system anlysis 自控 三阶系统的稳定性分析 matlab multisim仿真分析
Third order system anlysis 当 T0 = 1  ,T1 = 1 ,T2 = 1, K1 = 1 K2 = 1,时的matlab仿真分析 此时超调很大,稳定时间长 假设T0 = 1 ,  K1 = 1 K2 = 12,T1 = 0.1 T2 = 0.5  这样一来 我故意设置...
分类:其他好文   时间:2014-05-21 15:26:54    阅读次数:294
leetcode -day20 Add Two Numbers
1、 ?? 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 digit. Add the two num...
分类:其他好文   时间:2014-05-21 10:49:10    阅读次数:221
2C03-View-Layout-Animation-list-Reverse-Order
介绍list  item倒序显示 LayoutAnimation3.java /* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file e...
分类:其他好文   时间:2014-05-21 08:25:44    阅读次数:278
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