类似这样的语句在mysql oracle 是可以执行成功的,select * from
classfirst where (classid ,classname) not in (select classid, classname from
classfirst where classid=2 )但...
分类:
数据库 时间:
2014-05-05 11:15:31
阅读次数:
386
from://http://liangoogle.iteye.com/blog/1848448android
中theme.xml与style.xml的区别:相同点:两者的定义相同。不同点:一、使用的地方不同
1.theme.xml:对整个应用或某个Activity存在全局性影响。AndroidMa...
分类:
移动开发 时间:
2014-05-05 11:11:12
阅读次数:
407
最简单的方式是使用 mysql 的 ORDER BY RAND() 子句。SELECT
col1 FROM tbl ORDER BY RAND() LIMIT
10;它能很好的运行在小表中。然而,对于大表,生成随机列表行时将产生一个严重的性能问题,MYSQL 需要对每一行进行随机,然后对它们排序。即...
分类:
数据库 时间:
2014-05-05 11:04:53
阅读次数:
483
主要功能:实现 网页离线加载。基本思想来源于AFCache。作者是Rob
Napier(IOSX Programming的作者)。使用方法:To build, you will need the Reachability code
from Apple (included). That requir...
分类:
其他好文 时间:
2014-05-04 20:32:05
阅读次数:
1699
After a long and successful day of preparing food for the banquet, it is time to clean up. There is a list of n jobs to do before the kitchen can be closed for the night. These jobs are indexed from 1...
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其他好文 时间:
2014-05-04 18:25:07
阅读次数:
384
在memory.c里面有这么一段代码。为了其中的一句话,让我内牛满面啊!
dir = (unsigned long *) ((from>>20) & 0xffc)
int free_page_tables(unsigned long from,unsigned long size)
{
unsigned long *pg_table;
unsigned long...
分类:
系统相关 时间:
2014-05-04 18:22:41
阅读次数:
459
travel the binary tree by level 4 ( from down to top and from left to right every level )
个人信息:就读于燕大本科软件工程专业 目前大三;
本人博客:google搜索“cqs_2012”即可;
个人爱好:酷爱数据结构和算法,希望将来从事算法工作为人民作出自己的贡献;
博客内容:tr...
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其他好文 时间:
2014-05-04 18:22:16
阅读次数:
381
There are K nuclear reactor chambers labelled from 0 to K-1. Particles are bombarded onto chamber 0. The particles keep collecting in the chamber 0. However if at any time, there are more than N parti...
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其他好文 时间:
2014-05-04 18:00:17
阅读次数:
372
严重: Exception loading sessions from persistent storage
java.io.EOFException
删除Tomcat里面的work/Catalina/localhost下的内容即可解决
Tomcat在启动时出现如下异常问题:
严重: IOException while loading persisted sessions...
分类:
其他好文 时间:
2014-05-04 17:58:54
阅读次数:
313
??
SQL Server online consultants came across an interesting scenario where one of our client was unable to restore a native SQL Server backup successfully performed from one instance running on M...
分类:
数据库 时间:
2014-05-04 17:42:50
阅读次数:
394