How to use database commands in mysql

MySQL commands include: 1. Data manipulation language (DML): SELECT, INSERT, UPDATE, DELETE; 2. Data definition language (DDL): CREATE, ALTER, DROP; 3. Data control language (DCL) : GRANT, REVOKE; 4. Transaction control: BEGIN, COMMIT, ROLLBACK; 5. Utility programs: SHOW, DESCRIBE, HELP.

How to use MySQL database commands

MySQL provides a series of commands for managing and querying the database. These commands can be divided into the following categories:

Data Manipulation Language (DML)

• SELECT: Retrieve data
• INSERT：Insert data
• UPDATE：Update data
• DELETE：Delete data

Data Definition Language (DDL)

• CREATE: Create database, table, index and other objects
• ALTER : Modify existing objects
• DROP: Delete objects

Data Control Language (DCL)

• GRANT：Grant permission
• REVOKE：Revoke permission

Transaction Control

• BEGIN：Start transaction
• COMMIT：Commit transaction
• ROLLBACK：Rollback transaction

Utilities

• SHOW: View database information
• DESCRIBE: View table structure
• HELP: Get command help

Execute command

To execute MySQL command, you can use The following methods:

• Using the MySQL command line client (mysql)
• Through the application programming interface (such as JDBC, Python MySQL Connector)
• In the SQL editor Medium

Example

<code># 创建数据库
CREATE DATABASE my_database;

# 切换到数据库
USE my_database;

# 创建表
CREATE TABLE my_table (
  id INT NOT NULL AUTO_INCREMENT,
  name VARCHAR(255) NOT NULL,
  PRIMARY KEY (id)
);

# 插入数据
INSERT INTO my_table (name) VALUES ('John Doe');

# 检索数据
SELECT * FROM my_table;</code>

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