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projecteuler---->problem=22----Names scores
sing names.txt (right click and 'Save Link/Target As...'), a 46K text file containing over five-thousand first names, begin by sorting it into alphabetical order. Then working out the alphabetical v...
分类:其他好文   时间:2014-06-20 10:37:22    阅读次数:230
Outer Join Query Over Dblink Can Fail With ORA-904 (Doc ID 730256.1)
Outer Join Query Over Dblink Can Fail With ORA-904 (Doc ID 730256.1)To BottomModified:03-May-2013Type:PROBLEMIn this DocumentSymptomsChangesCauseSolut...
分类:数据库   时间:2014-06-13 13:41:16    阅读次数:376
Python笔记-Grouping Records Together Based on a Field
Grouping Records Together Based on a Field Problem You have a sequence of dictionaries or instances and you want to iterate over the data in groups based on the value of a...
分类:编程语言   时间:2014-06-08 18:22:29    阅读次数:280
Linux 内核 链表 的简单模拟(2)
接上一篇Linux 内核 链表 的简单模拟(1) 第五章:Linux内核链表的遍历/*** list_for_each - iterate over a list* @pos: the &struct list_head to use as a loop cursor.* @...
分类:系统相关   时间:2014-06-07 22:09:58    阅读次数:451
ORACLE SQL 获取连续28天有销售的店铺
最近公司一SSRS报表需求改变,同比店铺的选取为连续28天有销售的店铺,思考良久,发现可以利用ROW_NUMBER() OVER(PARTITION BY COLUMN01 ORDER BY COLUMN02)来实现,ROW_NUMBER()从1开始,按照COLUMN01分组以及COLUMN02排序...
分类:数据库   时间:2014-06-05 20:55:28    阅读次数:451
UVA 712 - S-Trees
题目如下: S-Trees  A Strange Tree (S-tree) over the variable set is a binary tree representing a Boolean function .Each path of the S-tree begins at the root node and consists ...
分类:其他好文   时间:2014-06-05 11:04:37    阅读次数:248
Flipped
More praise for FLIPPED"We flipped over this fantastic book, its gutsy girl Juli and its wise, wonderful ending."--The Chicago Tribune"Delightful! Del...
分类:其他好文   时间:2014-06-02 20:03:59    阅读次数:2055
窗口函数ntile()
一直没实际的需求而使用ntile(),今天看了下,就是按序号分组的意思。还是以student表为例select ntile(3) over (order by score desc) as zu, name, score, provincefrom student...
分类:其他好文   时间:2014-05-30 08:08:34    阅读次数:294
对python生成器特性使用的好例子
1.对序列进行分组的函数(摘自web.py源码utils.py文件中) 1 def group(seq, size): 2 """ 3 Returns an iterator over a series of lists of length size from iterable. ...
分类:编程语言   时间:2014-05-28 04:21:00    阅读次数:365
正则表达式中$1,$2 ===算是什么意思
能举个例子吗?我也知道是括号里面取得值 但是哪个和哪个括号不清楚 还有是小括号中括号大括号也不清楚 能举个实例吗?$1,$2...是表示的小括号里的内容 $1是第一个小括号里的 ,$2是第2个小括号里的 比如 /gai([\w]+?)over([\d]+)/ 匹配 gainover123 $1= 括...
分类:其他好文   时间:2014-05-26 00:04:22    阅读次数:282
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