Home Database Mysql Tutorial Introduction to MySQL character sets and collation order

Introduction to MySQL character sets and collation order

May 19, 2017 pm 03:14 PM

Character set and proofreading order

Character set is a method for people to map natural text to computer representation. It is a collection of some text and characters. Common ones include GBK (upgraded version of GB2312 character set), BIG5 character set, GB18030 character set, UTF-8 (upgraded version of Unicode character set), and collation rules are some rules specified in the character set (such as which characters are case-sensitive and which characters are not case-sensitive,
Open cmd and run after entering MYSQL

show character set
Copy after login


to check which character sets the server supports;

show collation
Copy after login


Character collation rules, if not Specify the corresponding character set collation rules, and the default mode will be used for collation and sorting;

show variables like "%character%";
Copy after login


View the system character set setting variables;

set names utf8
Copy after login


Sets the character set used for client and server connections;

Database tables are used to store and retrieve data. Different languages ​​and character sets require different ways of storing and retrieving data. Therefore, MySQL requires. Accommodating different character sets (different letters and characters), adapting to different methods of sorting and retrieving data

When discussing multiple languages ​​and character sets, you will encounter the following important terms:

1. Character set is a collection of letters and symbols;

2. Encoding is the internal representation of a certain character set member;

3. Proofreading is an instruction that specifies how characters are compared.

Why is it important to sort English text? Maybe not. Are the words APE, apex and Apple in the correct sorting order? It depends on whether you want to use case sensitivity. Written collation order, these words have one way of sorting, using case-insensitive collation has another way of sorting. This not only affects sorting (such as sorting data with ORDER BY), but also affects searching (for example, looking for WHERE of apple). clause can find APPLE). The situation is more complicated when using characters such as French à or German ö, and when using character sets that are not based on Latin (Japanese, Hebrew, Russian, etc.) More complicated.

In normal MySQL database activities (SELECT, INSERT, etc.), there is not much to worry about. The decision about which character set and collation to use is made at the server, database and table levels.

[Related recommendations]

1. mysql free video tutorial

2. MySQL transaction-use retention points, change the default commit Detailed explanation of behavior

3. MySQL transaction-ROLLBACK, detailed explanation of COMMIT usage

4. Explanation of MySQL transaction processing examples

5. MySQL UPDATE trigger (update) and trigger in-depth analysis

The above is the detailed content of Introduction to MySQL character sets and collation order. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial
1658
14
PHP Tutorial
1257
29
C# Tutorial
1231
24
MySQL's Role: Databases in Web Applications MySQL's Role: Databases in Web Applications Apr 17, 2025 am 12:23 AM

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

How to start mysql by docker How to start mysql by docker Apr 15, 2025 pm 12:09 PM

The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database

Laravel Introduction Example Laravel Introduction Example Apr 18, 2025 pm 12:45 PM

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

Solve database connection problem: a practical case of using minii/db library Solve database connection problem: a practical case of using minii/db library Apr 18, 2025 am 07:09 AM

I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.

MySQL and phpMyAdmin: Core Features and Functions MySQL and phpMyAdmin: Core Features and Functions Apr 22, 2025 am 12:12 AM

MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.

Laravel framework installation method Laravel framework installation method Apr 18, 2025 pm 12:54 PM

Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.

MySQL vs. Other Programming Languages: A Comparison MySQL vs. Other Programming Languages: A Comparison Apr 19, 2025 am 12:22 AM

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages ​​such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages ​​have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL vs. Other Databases: Comparing the Options MySQL vs. Other Databases: Comparing the Options Apr 15, 2025 am 12:08 AM

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

See all articles