function 7

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D3D coordinate system

1, there is a cube in the world coordinate system, the world transformation matrix is Worldmatrix, if the Worldmatrix is the unit matrix, then the center of the cube is located in the world coordinate system origin. 2, when the observation matrix is

MySQL Operation specification Summary

Source: quiet so far √ TuanUser Rights Management create user command:' username ' @ ' host ' identified by ' password ';Description: User name created by usernamehost specifies on which host the user can log on, if localhost is available to the

Linux related--record GDB basic operations

GdB really is a very powerful thing ah, here to record the basic operation of GDB itThe follow-up may be added, but for the time being enough you won't write much.The first is the Ubuntu Terminal 2 most basic operation: (otherwise will gdb but can

SQL execution Order

Execution order:The parsing order of SQL is from left to right, from top to bottom. (analogy compilation)The official given select query SQL structure is described below:SELECT [All | DISTINCT | Distinctrow] [high_priority]

Using MD5 encryption in a Linux database

MD5 encryption algorithm source code download: Https://pan.baidu.com/s/1nwyN0xVAfter the download is complete, unzip and get two filesEnvironment Construction:1. Copy the Md5.h file to the/usr/include/directorysudo cp md5.h/usr/include2. Compile and

SQL Server advanced Programming T-SQL programming functions

--String function--1, LEN: Returns the number of characters in a stringSelect Len (' China '), Len (' abc123! ')Select Len (' abc ' + ' 1 '), Len (' abc ')--2, Datalength: Returns the number of bytes in a stringSelect Datalength (' China '),

"| |" in Oracle statement What does it mean?

"| |" in Oracle statement What does it mean? "| |" in Oracle statement What does it mean? is the connector "+" with the string in Serversql a concept?1. Well yes is a meaning ... Select ' 1 ' | | ' 2 ' from dual rep 122. The connector "+" with the

The pristine series MySQL essentials

What you need to remember and master about MySQL finishing1.-- Show which threads are running -- View variables2. /* Database operation */------------------------------------------------------------------------------------------ ------------2. /*

Linux C Programming: Process Environment

A process terminates:A process can be registered if a (specific?? Verify the next) function, these functions are moved by exit?, these functions are called end-of-handle functions, and the ATEXIT function can register these functions. Exit tune? The

Turn: Oracle tablespace Query

1. Querying the table space names in the database 1) Querying all table spaces Select Tablespace_name from Dba_tablespaces;Select Tablespace_name from User_tablespaces; 2) query The used table space Select

Well-rounded MySQL optimization reference

This article has compiled some common methods of MySQL optimization, to do a simple summary sharing, to help those who do not have full-time MySQL DBA to do the basic optimization work, as for the specific SQL optimization, most by adding the

MySQL interview: Simply describe the MySQL optimization

1. The design of the database as far as possible to the database design of a smaller footprint of disk space.1). Use a smaller integer type whenever possible. (Mediumint is more appropriate than int).2). The definition field as far as possible is

Linux signal signal usage explanation and precautions

A signal is a software interrupt, an asynchronous communication method that handles an asynchronous event. For example, we run the program in the terminal, by pressing the keyboard "CTRL + C", you can send a SIGINT interrupt signal to stop the

One of the tools of web development technology--BEETL use notes

A , IntroductionBeetl, is a Bee Template Language abbreviation, it is not simply another template engine, but a new generation of template engine, it is powerful, good performance. B , Advantages for web applications, a controller must be used to

Linux networking entry (2): FTP Server

Article Title: Linux networking entry (2): FTP server. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open

jquery Basics-Selectors and effects

$ (this). Hide ()-----hides the current element$ ("P"). Hide ()------hides all paragraphs$ (". Test"). Hide ()--hides all elements of the class= "test"$ ("#test"). Hide ()--hides all elements of the id= "test"Document-Ready functions$ (document).

How to make a simple game with HTML5 canvas

In order to make it clear that HTML5 makes the simple process of making a game, we first make a very simple game and take a look at the process.The game is very simple, nothing more than a hero catches the monster to score, then the game starts

HTML5 a basic process of making "game"

How to make a simple game with HTML5 canvasIn order to make it clear that HTML5 makes the simple process of making a game, we first make a very simple game and take a look at the process.The game is very simple, nothing more than a hero catches the

JQuery's animate does not support the backgroundPosition solution on Firefox. jqueryanimate

JQuery's animate does not support the backgroundPosition solution on Firefox. jqueryanimate JQuery's animate is a very useful stuff, but some animation effects are not well supported. For example, Firefox, an artifact like backgroundPosition, cannot

JS code generation form to solve the MVC URL parameter too long problem

In an MVC project, the simplest way to typically download files is to use the location.href+ query parameter method directly.1 varSearchparams = {2Studentname: $ ("#StudentName"). Val (),3BirthDate: $ ("#BirthDate"). Val ()4 };5

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