如何在mysql数据库建表

CREATE TABLE table_name (
    column1 datatype [constraints],
    column2 datatype [constraints],
    ...
    PRIMARY KEY (column_name),
    FOREIGN KEY (column_name) REFERENCES other_table(column_name)
);

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    email VARCHAR(100) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- 创建数据库
CREATE DATABASE IF NOT EXISTS mydatabase;

-- 使用数据库
USE mydatabase;

-- 创建用户表
CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    email VARCHAR(100) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);