1. Character encoding
Correspondence table of characters and numbers
ASCII: can recognize English characters, 1Byte=1 English characters
hello
8bit|8bit|8bit|8bit| 8bit
GBK：汉字与英文字符，2Byte=1中文
Tag: foundation
[Data Structure] Basic Knowledge of Binary Tree
Total number of branches = number of summary points-1
Number of leaf nodes = number of double branch nodes + 1
Preface Traversal: Root left and right
Mid-order traversal: left roo
CentOS foundation configuration
1. User switching command. The current ordinary user logs in. If you want to switch to the root user, you need to enter the command # su; if you want to switch from the root user to the ordinary us
ZooKeeper foundation
1. The origin of zookeeper
Zookeeper originated from a research group in Yahoo Research Institute. At that time, researchers discovered that many large systems within Yahoo basically depend o
ZooKeeper Basic Mechanism Principle
Znode:
1. Znode is both a path (directory) and information (file)
2, Znode has two categories: One is divided into temporary nodes (session life cycle) and permanent nodes; two are divi
Hive Basics
hadoop hive 1) Hive was born in 2007,
2) 2014 hive 0.13.0 is very popular (it is relatively stable for the first time)
3) 2015hive1.2.0 (relatively only an upgrade)
4) 2016hive2.1
Hive Basics 1
hadoop hive (emphasis) day-6
1) Hive metadata (similar to tables, column lengths, etc.) storage On mysql
1)create table table_name like old_table //only table
2)create table table
SWIFT Basic Syntax – Data Type
Common Swift data types value type enum Optional structure (Struct) Bool, Int, Float, Double, Character String, Array, Dictionary, Set reference type class class
Sw The use of ift’s
Article 1: Foundation
%
#与
|
#OR
not
#非
#Rounding
7 // 4
#求余
10% 4
#power
2 ** 3
#A place to pay attention to floating-point operations
a = 4.2
b = 2.1
c = a + b #
Will you have a comprehensive configuration of Huawei?
1. Experimental topology:
650) this.width=650;” src =”/wp-content/uploadshttp:/img.voidcn.com/vcimg/static/loading.png” title=”Picture1.png” alt=”wKiom1Z9EbqRF5tvAABKkDMH0Ok635.png” d=”475462