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数据库(三)
DQL 查询语句-- select [列名,列名,列名...](投影) from 表名 -- [where 条件(0个或多个)]-- [group by 列名](分组)-- [having 条件](分组过滤) -- [order by 列名](排序)-- [limit 序号,长度](截取) -- 最 ...
分类:数据库   时间:2019-12-22 16:44:03    阅读次数:69
31.整数中1出现的次数(从1到n整数中1出现的次数)
题目描述 求出1~13的整数中1出现的次数,并算出100~1300的整数中1出现的次数?为此他特别数了一下1~13中包含1的数字有1、10、11、12、13因此共出现6次,但是对于后面问题他就没辙了。ACMer希望你们帮帮他,并把问题更加普遍化,可以很快的求出任意非负整数区间中1出现的次数(从1 到 ...
分类:其他好文   时间:2019-12-21 22:37:56    阅读次数:93
Find the Duplicate Number
Description Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), guarantee that at least one duplicate num ...
分类:其他好文   时间:2019-12-21 20:53:19    阅读次数:114
Minimum Spanning Tree
Description Given a list of Connections, which is the Connection class (the city name at both ends of the edge and a cost between them), find edges th ...
分类:其他好文   时间:2019-12-21 12:00:30    阅读次数:76
Difference between JDK, JRE and JVM
With Java programming language, the three terms i.e. JDK, JRE and JVM will always be there to understand the difference between them. If you area Java ...
分类:其他好文   时间:2019-12-20 20:37:09    阅读次数:101
DQL 数据查询语言
1.select 2.show ...
分类:编程语言   时间:2019-12-19 16:09:50    阅读次数:66
[LC] 287. Find the Duplicate Number
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. ...
分类:其他好文   时间:2019-12-19 12:50:24    阅读次数:95
1281. Subtract the Product and Sum of Digits of an Integer
Given an integer number n, return the difference between the product of its digits and the sum of its digits. Example 1: Input: n = 234 Output: 15 Exp ...
分类:其他好文   时间:2019-12-19 09:20:24    阅读次数:92
最小生成树专题
B - Networking POJ - 1287 You are assigned to design network connections between certain points in a wide area. You are given a set of points in the a ...
分类:其他好文   时间:2019-12-18 23:24:52    阅读次数:107
搭建zoopker+hbase 环境
继续上一篇hadoop的安装。一、安装zookooper1、解压zookoopertar-zxfvzookeeper-3.3.6.tar.gz2、修改配置:cpzookeeper/conf/zoo_sample.cfgzoo.cfgThenumberofmillisecondsofeachticktickTime=2000Thenumberofticksthattheinitialsynchron
分类:其他好文   时间:2019-12-18 11:07:30    阅读次数:180
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