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MySQL Order By Rand()效率【转载】
最近由于需要大概研究了一下MYSQL的随机抽取实现方法。举个例子,要从tablename表中随机提取一条记录,大家一般的写法就是:SELECT * FROM tablename ORDER BY RAND() LIMIT 1。但是,后来我查了一下MYSQL的官方手册,里面针对RAND()的提示大概意...
分类:数据库   时间:2014-07-16 23:21:23    阅读次数:373
SQL Server 2012 新的分页函数 OFFSET & FETCH NEXT
DECLARE @page INT, @size INT;select @page = 300, @size = 10SELECT *FROM gpcomp1.GPCUSTWHERE company like 'a%'ORDER BY CUSTNOOFFSET (@page -1) * @size ...
分类:数据库   时间:2014-07-16 23:11:46    阅读次数:315
gold mining in China
A quarry operator in the Libyan needed to expand their crushing and screening plant in order to cope with an increase in chip and sand demand from the...
分类:其他好文   时间:2014-07-10 12:56:46    阅读次数:253
rails 中model之间的 association (:inverse_of)
class Customer < ActiveRecord::Base has_many :ordersendclass Order < ActiveRecord::Base belongs_to :customerend如上代码两个model在做如下查询的时候:c = Customer.fir.....
分类:其他好文   时间:2014-07-10 10:03:57    阅读次数:293
Scala 中的函数式编程基础(二)
主要来自 Scala 语言发明人 Martin Odersky 教授的 Coursera 课程 《Functional Programming Principles in Scala》。2. Higher Order Functions把其他函数作为参数或者作为返回值,就是 higher order...
分类:其他好文   时间:2014-07-07 23:27:55    阅读次数:412
自己动手编译apache-tomcat-6.0.41-src源码
第一步:下载apache-tomcat-6.0.41-src第二步:阅读BUILDING.txt。了解所需要的步骤。In order to build a binary distribution version of Apache Tomcat from asource distribution, ...
分类:其他好文   时间:2014-07-07 20:21:08    阅读次数:359
Problem Flatten Binary Tree
Problem Description:Given a binary tree, flatten it to a linked list in-place.Solution:对二叉树进行前序遍历(pre-order). 1 public void flatten(TreeNode root) { 2...
分类:其他好文   时间:2014-07-07 18:47:24    阅读次数:306
[Leetcode][Tree][Binary Tree Level Order Traversal ]
树的层次遍历,比较简单,3个题的做法完全一样,只是在特定的地方对结果进行reverse。1、Binary Tree Level Order Traversal/** * Definition for binary tree * struct TreeNode { * int val; * ...
分类:其他好文   时间:2014-07-07 16:39:56    阅读次数:194
[leetcode] Sort Colors
Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, ...
分类:其他好文   时间:2014-07-07 14:54:18    阅读次数:219
Leetcode Spiral Matrix
Given a matrix ofmxnelements (mrows,ncolumns), return all elements of the matrix in spiral order.For example,Given the following matrix:[ [ 1, 2, 3 ],...
分类:其他好文   时间:2014-07-07 14:22:37    阅读次数:210
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