码迷,mamicode.com
首页 >  
搜索关键字:copy from    ( 69860个结果
oracle mysql sql serve where in 语句的不同
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
android 中theme.xml与style.xml的区别
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
mysql 如何选择随机行
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
离线缓存之RNCachingURLProtocol解析
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
codechef Cleaning Up 题解
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...
分类:其他好文   时间:2014-05-04 18:25:07    阅读次数:384
《linux 内核完全剖析》上帝为什么是右移20,而不是22! dir = (unsigned long *) ((from>>20) & 0xffc)
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 )
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...
分类:其他好文   时间:2014-05-04 18:22:16    阅读次数:381
Codechef Nuclear Reactors 题解
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...
分类:其他好文   时间:2014-05-04 18:00:17    阅读次数:372
Exception loading sessions from persistent storage
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
[TroubleShooting]'trn\bak' is incorrectly formed. SQL Server cannot process this media family.
?? 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
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!