Database system Basics Note (3)--primary key/foreign key index

Label:This article reproduced from:http://www.cnblogs.com/longyi1234/archive/2010/03/24/1693738.html Blue Sky First, what is the primary key, foreign key relational database in a record in a number of attributes, ifAn attribute group (note is a

sql--w3c

Label:RdbmsRDBMS refers to a relational database management system.The RDBMS is the foundation of SQL and is also the foundation of all modern database systems, such as MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.Data in an RDBMS is

01.WAMP Build [WIN7+APACHE2.4+MYSQL5.7+PHP7

Label: Wamp Construction [WIN7+APACHE2.4+MYSQL5.7+PHP7 I. BACKGROUND Replace the computer's optical drive with a solid-state drive (120g), which is designed to work with a single system. Phpstudy and Wamp have been used

sql2005 Database Daquan

Label:Enterprise DVD SQL Server 2005 Enterprise Edition (support for very large enterprises)32-bit DVD:ed2k://|file|cs_sql_2005_ent_x86_dvd.iso|972310528|4ceef4b959894fd78c8f8416b4ba533e|/64-bit DVD:ed2k://|file|cs_sql_2005_ent_x64_dvd.iso|1019222016

Win7 installation oracle10g prompt Unable to determine host IP address solution

Label:A modification of the Hosts file1. Open file C:\Windows\System32\drivers\etc\hosts (directly double-click to open with Notepad)2. Remove the ' # ' before the last two lines at the end of the file3. Then leave the previous line to the native IP

Compression and decompression methods for many compressed files such as tar gz bz2 tgz Z

Label:The most common packaging program under Linux is tar, which is often referred to as the TAR package, and the tar package file commands are usually terminated with. Tar. After the tar package is generated, it can be compressed with other

Base algorithm 10: Filters (filter) do not filter on a specified path

Tags: filtering filter(1) Configure such a filter in Web. xml:<!--  Filter Xss --><filter><filter-name>xssfilter </filter-name><filter-class>cn.zifangsky.filter.XSSFilter</filter-class><init-param>

Memory optimization of Unity3d game development

Label:The performance optimization of a project revolves around the CPU, GPU, and memory in three major ways.Memory management is a priority in the development phase, whether it is a game or a VR application.However, in the large number of projects

Decision tree--Summary of ID3 algorithm

Label:The ID3 algorithm (iterative dichotomiser 3 iterative binary Tree 3) is an algorithm used by Ross Quinlan for decision Trees, and the simple theory is that the smaller decision trees are better than the larger decision trees.Algorithm

Sort 1-Simple selection sort

Label: Choose the basic idea of sorting :Scan n Records, select the smallest record to output it, then scan the remaining N-1 records, select the smallest record to output, ... Repeat the process until the last record is left. 1 //1.

Neural Network algorithm

Label:Content Summary:(1) introduce the basic principle of neural network(2) Aforge.net method of realizing Feedforward neural network(3) the method of Matlab to realize feedforward neural network---cited Examples  In this paper, fisher's iris

Win8 power icon does not show up

Tags: icons http other exe win WIN8 ATI configuration nbspSolution:1. First determine if the icon is hidden. Click the small triangle symbol in the lower right corner of the taskbar to open the hidden icon, like this:2. If you can see your icon here,

Free Activation Installation Genuine WIN10 Professional Edition tutorial

Tags: Windows keyword Microsoft official operating system compatibilityWith the release of Windows 10, many users are using this new generation of operating systems. One of the best things about Windows 10 is that you can get an activated Windows 10

Windows10 How to close all programs with one click?

Tags: Next friend program how MacauWith the use of win10 system of friends more and more, about the use of WIN10 also become important, some friends feedback in the open many programs after the system will become very slow, then to a close also

ES6 block-level scope and new variable declaration (let)

Tags: statement targe ror erro Access alert web number LSPMany languages have block-level scopes, but JS does not, it uses VAR to declare variables, the function to divide the scope, curly braces "{}" does not limit the scope of var. Variables

Distributed Service Framework Zookeeper--managing data in a distributed environment

Tags: host des splay Erro etc rules UIL knowledge rooZookeeper Distributed Service Framework is a sub-project of Apache Hadoop, which is mainly used to solve some data management problems commonly encountered in distributed applications, such as:

Common Mailbox Server (SMTP, POP3) addresses, ports

Tags: Table mail 20px SSL com google live Sina needReprint: http://blog.sina.com.cn/s/blog_6e85b10501012kyv.html Gmail (google.com)POP3 Server address: pop.gmail.com (SSL enabled port: 995)SMTP Server address: smtp.gmail.com

TCP/IP protocol

Tags: how data flow control site management row data Mac efficiency titleWhy is there a TCP/IP protocolAll over the world, a wide variety of computers run their own different operating systems for everyone, and these computers are used in many ways

Small white Diary passive information collection of 2:kali penetration test (i)

Tags: server reply His word href rtu the OSI files roughlyFirst, passive information collection Passive information collection refers to the information available through the open channel, and the target system does not produce direct

Whether you should use for or foreach when iterating through the collection

Tags: generator for allow include useful issues: Adjust path code generationFor this record, the matching PostgreSQL user is declared, and the value all indicates that it matches all users. Otherwise, it is the name of a particular PostgreSQL user,

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