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LINQ SQL分组取最近一条记录
最近项目有一个需求,从订单表查询出每个客户最近一条订单记录。数据库表结构如下图 SELECT * FROM ( select ROW_NUMBER()over(partition by [custid] order by [orderdate] d...
分类:数据库   时间:2015-05-20 12:55:35    阅读次数:272
spark优化之并行度
这个其实我前面已经记录过了,这里在记录一下。我可以通过参数人为的来控制分区大小,增加分区中即可增加任务的并行度,并行度高自然运行的就快了嘛。官方推荐集群中每个cpu并行的任务是2-3个(也就是2-3个partition),这样对于资源使用是最充分的那么如何调整并行度呢。在类似 sc.textFile...
分类:其他好文   时间:2015-05-20 12:40:42    阅读次数:414
手工Ghost安装系统
(1)其实手工ghost很简单,正确操作的话是不会有什么问题的,在PE下,打开ghost程序(2)按任意键进入ghost操作界面,出现ghost菜单,我们现在只用到Local菜单项,下面有三个子项:Disk(硬盘备份与还原)、Partition(磁盘分区备份与还原)、Check(硬盘检测),我们手工...
分类:其他好文   时间:2015-05-20 00:19:02    阅读次数:127
Java for LeetCode 086
Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x.You should preserve the o...
分类:编程语言   时间:2015-05-19 22:23:36    阅读次数:165
Oracle高级查询之OVER (PARTITION BY ..)
为了方便大家学习和测试,所有的例子都是在Oracle自带用户Scott下建立的。注:标题中的红色orderby是说明在使用该方法的时候必须要带上orderby。一、rank()/dense_rank()over(partitionby...orderby...)现在客户有这样一个需求,查询每个部门工资最高的雇员的信息,相信有一定o..
分类:数据库   时间:2015-05-19 19:18:31    阅读次数:194
Android MMC/EMMC/MTD Partition Layout
Android devices have a couple of partitions to store different data.The common ones are the recovery, boot, system, data and cache partitions.Almost e...
分类:移动开发   时间:2015-05-19 12:27:17    阅读次数:644
Leetcode第九题_Palindrome Number
Palindrome Number Some hints:Could negative integers be palindromes? (ie, -1)If you are thinking of converting the integer to string, note the restriction of using extra space.You could also try revers...
分类:其他好文   时间:2015-05-19 10:43:23    阅读次数:122
How To Backup Your Android Phone’s Boot, Recovery And System Partition Images -- RomDump
One can’t stress enough on the importance of backups and when it comes to tinkering with your Android phone, a backup of your system, recovery and boo...
分类:移动开发   时间:2015-05-19 08:51:37    阅读次数:256
Partition List
Given a linked list and a valuex, partition it such that all nodes less thanxcome before nodes greater than or equal tox.You should preserve the origi...
分类:其他好文   时间:2015-05-18 20:35:52    阅读次数:101
[LeetCode-JAVA] Partition List
题目:Given a linked list and a valuex, partition it such that all nodes less thanxcome before nodes greater than or equal tox.You should preserve the or...
分类:编程语言   时间:2015-05-18 20:18:56    阅读次数:106
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