bbs数据库设计sql

BBS（Bulletin Board System）是一种在线交流平台，其数据库设计需要考虑以下几个方面：

1. 用户表设计：

CREATE TABLE users (
id INT(11) NOT NULL AUTO_INCREMENT,
username VARCHAR(50) NOT NULL,
password VARCHAR(50) NOT NULL,
email VARCHAR(50) NOT NULL,
PRIMARY KEY (id)
);

2. 帖子表设计：

CREATE TABLE posts (
id INT(11) NOT NULL AUTO_INCREMENT,
user_id INT(11) NOT NULL,
title VARCHAR(255) NOT NULL,
content TEXT NOT NULL,
created_at DATETIME NOT NULL,
updated_at DATETIME NOT NULL,
PRIMARY KEY (id),
FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);

3. 评论表设计：

CREATE TABLE comments (
id INT(11) NOT NULL AUTO_INCREMENT,
user_id INT(11) NOT NULL,
post_id INT(11) NOT NULL,
content TEXT NOT NULL,
created_at DATETIME NOT NULL,
updated_at DATETIME NOT NULL,
PRIMARY KEY (id),
FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE
);

4. 点赞表设计：

CREATE TABLE likes (
id INT(11) NOT NULL AUTO_INCREMENT,
user_id INT(11) NOT NULL,
post_id INT(11) NOT NULL,
created_at DATETIME NOT NULL,
PRIMARY KEY (id),
FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE
);

以上是BBS数据库设计的简要示例，可以根据实际需求进行调整。