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
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
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
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
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 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...
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其他好文 时间:
2014-05-21 16:35:01
阅读次数:
271
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...
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其他好文 时间:
2014-05-21 16:26:59
阅读次数:
234
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...
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其他好文 时间:
2014-05-21 15:26:54
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294
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...
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其他好文 时间:
2014-05-21 10:49:10
阅读次数:
221
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