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MySql优化子查询
用子查询语句来影响子查询中产生结果rows的数量和顺序. For example:SELECT * FROM t1 WHERE t1.column1 IN (SELECT column1 FROM t2 ORDER BY column1);SELECT * FROM t1 WHERE t1.col....
分类:数据库   时间:2015-05-18 18:38:35    阅读次数:165
MySQL中group_concat函数
本文通过实例介绍了MySQL中的group_concat函数的使用方法,比如select group_concat(name) 。MySQL中group_concat函数完整的语法如下:group_concat([DISTINCT] 要连接的字段 [Order BY ASC/DESC 排序字段] [...
分类:数据库   时间:2015-05-18 16:32:42    阅读次数:189
sqlserver查询某一字段重复超5次的所有记录
用的sqlserver2008 r2。SELECT*FROM t_classWHERE idIN (SELECTidFROM (SELECTROW_NUMBER() OVER (PARTITION BY id ORDER BY inserttime) AS rn,idFROM t_class) my...
分类:数据库   时间:2015-05-18 14:16:47    阅读次数:142
leetcode--Sort Colors
题目描述: 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, white and blue. Here, we will use the ...
分类:其他好文   时间:2015-05-18 09:18:05    阅读次数:118
LightOJ1364---Expected Cards(概率dp+三进制状压)
Taha has got a standard deck of cards with him. In addition to the 52 regular ones, there are 2 joker cards. Every regular card has a rank and a suit. The ranks in ascending order are: A, 2, 3, 4, 5, 6...
分类:其他好文   时间:2015-05-18 09:10:39    阅读次数:163
DataContractSerializer数据不一致下序列化
一、数据类型的等效性 例如下面定义的两个类成员名称、定义顺序都不一样,但是在DataContract、DataMember的Name属性作用下,两个类的实例对象序列化后的xml是一样的,因此Order和OrderV2对于DataContractSerializer序列化是等效的。 [DataC...
分类:其他好文   时间:2015-05-17 20:10:44    阅读次数:147
【leetcode】Convert Sorted List to Binary Search Tree
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 1 class Solution { 2 public: 3 int l...
分类:其他好文   时间:2015-05-17 18:38:05    阅读次数:87
Java for LeetCode 075 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:编程语言   时间:2015-05-17 18:27:23    阅读次数:132
SQL 根据时间和打印状态抽取记录
1.首先要是没有打印的记录。2.其次是要按照时间,时间是要按照倒序排列。1 1 select Top 10 下载文件的URL from 表的名称 where 是否打印 = 0 and order by 上传时间 desc*是否打印,使用字段bit,0是没有打印,1是已经打印
分类:数据库   时间:2015-05-17 18:18:11    阅读次数:129
Binary Tree Level Order Traversal
class Solution {public:vector > res;public:void trval(TreeNode *root,int level){if(root==NULL)return;if(level==res.size()){vector v;res.push_back(v);}...
分类:其他好文   时间:2015-05-17 18:10:38    阅读次数:92
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