MySQL数据库基础练习系列16、在线问卷调查系统

-- 创建用户表
CREATE TABLE users (
    -- 用户ID，自增主键
    user_id INT AUTO_INCREMENT PRIMARY KEY,
    -- 用户名，唯一且不能为空
    username VARCHAR(50) NOT NULL UNIQUE,
    -- 用户密码，不能为空（建议存储加密后的密码）
    password VARCHAR(255) NOT NULL,
    -- 用户邮箱，唯一且可以为空（根据实际情况可设为NOT NULL）
    email VARCHAR(100) UNIQUE,
    -- 用户性别，通过char(2)类型存储，如'男'或'女'，默认值为'男'
    gender_id char(2) DEFAULT '男'
);


-- 创建调查表
CREATE TABLE surveys (
    -- 调查ID，自增主键
    survey_id INT AUTO_INCREMENT PRIMARY KEY,
    -- 调查标题，不能为空
    title VARCHAR(255) NOT NULL,
    -- 调查描述，可以为空
    description TEXT,
    -- 创建者ID，外键关联users表的user_id
    creator_id INT,
    -- 创建时间，默认为当前时间戳
    create_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    -- 设置外键约束，确保引用的数据存在
    FOREIGN KEY (creator_id) REFERENCES users(user_id)
);


-- 创建问题表
CREATE TABLE questions (
    -- 问题ID，自增主键
    question_id INT AUTO_INCREMENT PRIMARY KEY,
    -- 所属调查ID，外键关联surveys表的survey_id
    survey_id INT,
    -- 问题文本，不能为空
    question_text VARCHAR(255) NOT NULL,
    -- 问题类型，如单选、多选、文本等，不能为空
    question_type VARCHAR(50) NOT NULL,
    -- 设置外键约束，确保引用的数据存在
    FOREIGN KEY (survey_id) REFERENCES surveys(survey_id)
);


-- 创建选项表
CREATE TABLE options (
    -- 选项ID，自增主键
    option_id INT AUTO_INCREMENT PRIMARY KEY,
    -- 所属问题ID，外键关联questions表的question_id
    question_id INT,
    -- 选项文本，不能为空
    option_text VARCHAR(255) NOT NULL,
    -- 设置外键约束，确保引用的数据存在
    FOREIGN KEY (question_id) REFERENCES questions(question_id)
);


-- 创建回答表
CREATE TABLE responses (
    -- 回答ID，自增主键
    response_id INT AUTO_INCREMENT PRIMARY KEY,
    -- 用户ID，外键关联users表的user_id
    user_id INT,
    -- 所属调查ID，外键关联surveys表的survey_id
    survey_id INT,
    -- 所属问题ID，外键关联questions表的question_id
    question_id INT,
    -- 回答文本，用于存储文本输入类型的答案，可以为空
    response_text TEXT,
    -- 选项ID，用于存储选择类型的答案，可以为空（对于文本类型的答案则不使用此字段）
    option_id INT,
    -- 回答时间，默认为当前时间戳
    response_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    -- 设置外键约束，确保引用的数据存在
    FOREIGN KEY (user_id) REFERENCES users(user_id),
    FOREIGN KEY (survey_id) REFERENCES surveys(survey_id),
    FOREIGN KEY (question_id) REFERENCES questions(question_id),
    -- 注意：此处的option_id外键设置可能需要根据业务逻辑进行调整，因为不是所有问题类型都有选项
    -- 如果只有选择题才有选项，则可以考虑去掉这个外键约束，或者采用其他方式处理
    FOREIGN KEY (option_id) REFERENCES options(option_id)
);

INSERT INTO users (username, password, email, gender_id) VALUES
('张三', 'password1', 'user1@example.com', '男'),
('李四', 'password2', 'user2@example.com', '女'),
('赵六', 'password3', 'user3@example.com', '男'),
('阮小七', 'password4', 'user4@example.com', '女'),
('王五', 'password5', 'user5@example.com', '男');

INSERT INTO surveys (title, description, creator_id) VALUES
('用户满意度调查', '关于产品使用满意度的调查', (SELECT user_id FROM users WHERE username = '赵六')),
('新功能反馈', '收集用户对新功能的意见和建议', (SELECT user_id FROM users WHERE username = '王五'));

INSERT INTO questions (survey_id, question_text, question_type) VALUES
((SELECT survey_id FROM surveys WHERE title = '用户满意度调查'), '您对产品整体满意吗？', '单选'),
((SELECT survey_id FROM surveys WHERE title = '用户满意度调查'), '您最喜欢产品的哪个功能？', '多选'),
((SELECT survey_id FROM surveys WHERE title = '新功能反馈'), '您认为新功能有哪些可以改进的地方？', '文本');

INSERT INTO options (question_id, option_text) VALUES
((SELECT question_id FROM questions WHERE question_text = '您对产品整体满意吗？' AND survey_id = (SELECT survey_id FROM surveys WHERE title = '用户满意度调查')), '非常满意'),
((SELECT question_id FROM questions WHERE question_text = '您对产品整体满意吗？' AND survey_id = (SELECT survey_id FROM surveys WHERE title = '用户满意度调查')), '满意'),
((SELECT question_id FROM questions WHERE question_text = '您最喜欢产品的哪个功能？' AND survey_id = (SELECT survey_id FROM surveys WHERE title = '用户满意度调查')), '功能A'),
((SELECT question_id FROM questions WHERE question_text = '您最喜欢产品的哪个功能？' AND survey_id = (SELECT survey_id FROM surveys WHERE title = '用户满意度调查')), '功能B'),
((SELECT question_id FROM questions WHERE question_text = '您最喜欢产品的哪个功能？' AND survey_id = (SELECT survey_id FROM surveys WHERE title = '用户满意度调查')), '功能C');

INSERT INTO responses (user_id, survey_id, question_id, response_text, option_id) VALUES
((SELECT user_id FROM users WHERE username = 'user1'), (SELECT survey_id FROM surveys WHERE title = '用户满意度调查'), (SELECT question_id FROM questions WHERE question_text = '您对产品整体满意吗？' AND survey_id = (SELECT survey_id FROM surveys WHERE title = '用户满意度调查')), NULL, (SELECT option_id FROM options WHERE option_text = '非常满意')),
((SELECT user_id FROM users WHERE username = 'user1'), (SELECT survey_id FROM surveys WHERE title = '用户满意度调查'), (SELECT question_id FROM questions WHERE question_text = '您最喜欢产品的哪个功能？' AND survey_id = (SELECT survey_id FROM surveys WHERE title = '用户满意度调查')), '功能A, 功能B', NULL);