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diff --git a/mysql/README.md b/mysql/README.md
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+各SQL文件存放内容的说明
+
+
+
+1、mymanager.sql
+
+（1）创建表的SQL语句（CREATE TABLE）；
+
+（2）新增数据的SQL语句（INSERT）；
+
+（3）创建触发器的SQL语句（CREATE TRIGGER）；
+
+（4）创建视图的SQL语句（CREATE VIEW）；
+
+（5）创建用户的SQL语句（CREATE USER）；
+
+（6）分配权限的SQL语句（GRANT）。
+
+【依次对应课程设计报告】3.4，3.5.1，3.5.7，3.5.4，3.5.8
+
+
+
+2、mymanager_select.sql
+
+查询的SQL语句（SELECT）
+
+【对应课程设计报告】3.5.2
+
+
+
+3、mymanager_update.sql
+
+更新的SQL语句（UPDATE）
+
+【对应课程设计报告】3.5.3 UPDATE部分
+
+
+
+
+4、mymanager_delete.sql
+
+删除的SQL语句（DELETE）
+
+【对应课程设计报告】3.5.3 DELETE部分
+
diff --git a/mysql/README.pdf b/mysql/README.pdf
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diff --git a/mysql/mymanager.sql b/mysql/mymanager.sql
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+++ b/mysql/mymanager.sql
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+DROP TABLE IF EXISTS `admin`;
+CREATE TABLE `admin`  (
+  `id` int NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '用户名',
+  `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '密码',
+  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '姓名',
+  `avatar` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '头像',
+  `role` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '角色标识',
+  `phone` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '电话',
+  `email` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '邮箱',
+  PRIMARY KEY (`id`) USING BTREE,
+  UNIQUE INDEX `unique_admin_username`(`username` ASC) USING BTREE,
+  UNIQUE INDEX `unique_admin_email`(`email` ASC) USING BTREE
+) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '管理员' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO admin (id, username, password, name, avatar, role, phone, email)
+VALUES 
+(1, 'flyao', 'admin', '姚昊', 'http://localhost:9090/files/1735014296914-下载.png', 'ADMIN', NULL, NULL),
+(2, 'Yuki', '123', '梁羽睿', NULL, 'ADMIN', '15905487698', 'yuki.yr.liang@gmail.com'),
+(3, '1', '123', '1', NULL, 'ADMIN', NULL, NULL),
+(4, 'admin1', 'admin123', '李华', 'http://localhost:9090/files/1735014296915-下载1.png', 'ADMIN', '13900139000', 'lihua@example.com'),
+(5, 'admin2', 'admin1234', '王丽', 'http://localhost:9090/files/1735014296916-下载2.png', 'ADMIN', '13700137000', 'wangli@example.com'),
+(6, 'admin3', 'admin12345', '赵强', 'http://localhost:9090/files/1735014296917-下载3.png', 'ADMIN', '13600136000', 'zhaoqiang@example.com'),
+(7, 'admin4', 'admin123456', '孙敏', 'http://localhost:9090/files/1735014296918-下载4.png', 'ADMIN', '13500135000', 'sunmin@example.com'),
+(8, 'admin5', 'admin1234567', '周杰', 'http://localhost:9090/files/1735014296919-下载5.png', 'ADMIN', '13400134000', 'zhoujie@example.com'),
+(9, 'admin6', 'admin12345678', '吴娜', 'http://localhost:9090/files/1735014296920-下载6.png', 'ADMIN', '13300133000', 'wuna@example.com'),
+(10, 'admin7', 'admin123456789', '郑刚', 'http://localhost:9090/files/1735014296921-下载7.png', 'ADMIN', '13200132000', 'zhenggang@example.com'),
+(11, 'admin8', 'admin1234567890', '钱丽', 'http://localhost:9090/files/1735014296922-下载8.png', 'ADMIN', '13100131000', 'qianli@example.com'),
+(12, 'admin9', 'admin12345678901', '王明', 'http://localhost:9090/files/1735014296923-下载9.png', 'ADMIN', '13000130000', 'wangming@example.com');
+
+
+
+DROP TABLE IF EXISTS `activity_publisher`;
+CREATE TABLE `activity_publisher` (
+  `id` int NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `role` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '角色名称',
+  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '姓名',
+  `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '用户名',
+  `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '密码',
+  `email` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '邮箱地址',
+  `phone` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '电话号码',
+  `organization` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '组织名称',  -- 组织名称字段
+  `address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '地址',
+  `avatar` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '头像图片',
+  PRIMARY KEY (`id`) USING BTREE,
+  UNIQUE INDEX `unique_publisher_username`(`username` ASC) USING BTREE,
+  UNIQUE INDEX `unique_publisher_email`(`email` ASC) USING BTREE
+) ENGINE = InnoDB AUTO_INCREMENT = 8 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '活动发布者信息表' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `activity_publisher` (id, role, name, username, password, email, phone, organization, address, avatar)
+VALUES 
+(1, 'ACTIVITY_PUBLISHER', '姚昊', 'flyao1', 'password123', NULL, NULL, '科技协会', '北京市朝阳区', NULL),
+(2, 'ACTIVITY_PUBLISHER', '梁羽睿', 'Yuki1', 'password456', 'yuki.yr.liang@gmail.com', '15905487698', '水下社区', '上海市浦东新区', NULL),
+(3, 'ACTIVITY_PUBLISHER', '张伟', 'zhangwei', 'password123', 'zhangwei@example.com', '13812345678', '珊瑚礁保护组织', '广州市天河区', 'http://localhost:9090/files/avatar1.png'),
+(4, 'ACTIVITY_PUBLISHER', '李婷', 'liting', 'password456', 'liting@example.com', '13987654321', '海洋生物研究会', '杭州市西湖区', 'http://localhost:9090/files/avatar2.png'),
+(5, 'ACTIVITY_PUBLISHER', '王芳', 'wangfang', 'password789', 'wangfang@example.com', '13798765432', '环保志愿者团队', '福建厦门', 'http://localhost:9090/files/avatar3.png'),
+(6, 'ACTIVITY_PUBLISHER', '赵敏', 'zhaomin', 'password202', 'zhaomin@example.com', '13512345678', '潜水培训中心', '杭州市西湖区', 'http://localhost:9090/files/avatar5.png'),
+(7, 'ACTIVITY_PUBLISHER', '张三', 'zhangsan', 'password203', 'zhangsanmin@example.com', '13512345671', '海洋科技公司', '湖北武汉', 'http://localhost:9090/files/avatar6.png'),
+(8, 'ACTIVITY_PUBLISHER', '李四', 'lisi', 'password204', 'lisi@example.com', '13512345672', '海洋教育机构', '陕西西安', 'http://localhost:9090/files/avatar7.png'),
+(9, 'ACTIVITY_PUBLISHER', '王五', 'wangwu', 'password205', 'wangwu@example.com', '13512345673', '海洋旅游公司', '重庆', 'http://localhost:9090/files/avatar8.png'),
+(10, 'ACTIVITY_PUBLISHER', '孙六', 'sunliu', 'password206', 'sunliu@example.com', '13512345674', '深海探险队', '深圳', 'http://localhost:9090/files/avatar9.png');
+
+
+
+DROP TABLE IF EXISTS `user`;
+CREATE TABLE `user`  (
+  `id` int NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `username` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '用户名',
+  `password` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '密码',
+  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '姓名',
+  `avatar` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '头像',
+  `role` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '角色标识',
+  `sex` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '性别',
+  `phone` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '电话',
+  `email` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '邮箱',
+  `info` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '简介',
+  `birth` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '生日',
+  PRIMARY KEY (`id`) USING BTREE,
+  UNIQUE INDEX `unique_username`(`username` ASC) USING BTREE,
+  UNIQUE INDEX `unique_email`(`email` ASC) USING BTREE,
+  CONSTRAINT `check_user_sex` CHECK (`sex` in (_utf8mb4'男',_utf8mb4'女'))
+) ENGINE = InnoDB AUTO_INCREMENT = 14 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '用户信息' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `user` (id, `username`, `password`, `name`, `avatar`, `role`, `sex`, `phone`, `email`, `info`, `birth`)
+VALUES 
+(1, 'flyao2', 'password1', '姚昊', NULL, 'USER', '男', NULL, NULL, '热爱编程', '2002-03-27'),
+(2, 'Yuki2', 'password2', '梁羽睿', NULL, 'USER', '女', NULL, NULL, '喜欢旅行', '2004-07-13'),
+(3, 'user3', 'password3', '王五', 'http://example.com/avatar3.jpg', 'USER', '男', '13800138003', 'wangwu@example.com', '运动爱好者', '1994-03-03'),
+(4, 'user4', 'password4', '赵六', 'http://example.com/avatar4.jpg', 'USER', '女', '13800138004', 'zhaoliu@example.com', '音乐发烧友', '1996-04-04'),
+(5, 'user5', 'password5', '孙七', 'http://example.com/avatar5.jpg', 'USER', '男', '13800138005', 'sunqi@example.com', '电影迷', '1998-05-05'),
+(6, 'user6', 'password6', '周八', 'http://example.com/avatar6.jpg', 'USER', '女', '13800138006', 'zhouba@example.com', '美食家', '2000-06-06'),
+(7, 'user7', 'password7', '吴九', 'http://example.com/avatar7.jpg', 'USER', '男', '13800138007', 'wujiu@example.com', '摄影爱好者', '2002-07-07'),
+(8, 'user8', 'password8', '郑十', 'http://example.com/avatar8.jpg', 'USER', '女', '13800138008', 'zhengshi@example.com', '读书达人', '2004-08-08'),
+(9, 'user9', 'password9', '钱十一', 'http://example.com/avatar9.jpg', 'USER', '男', '13800138009', 'qianyiyi@example.com', '游戏控', '2006-09-09'),
+(10, 'user10', 'password10', '王十二', 'http://example.com/avatar10.jpg', 'USER', '女', '13800138010', 'wangshizhi@example.com', '时尚博主', '2008-10-10');
+
+
+
+DROP TABLE IF EXISTS `activity`;
+CREATE TABLE `activity` (
+  `id` int NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '活动名称',
+  `descr` varchar(1000) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '活动简介',
+  `content` longtext CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL COMMENT '活动内容',
+  `start` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '开始时间',
+  `end` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '结束时间',
+  `form` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '活动形式',
+  `address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '活动地址',
+  `host` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '主办方',
+  `publisher_id` int NULL DEFAULT NULL COMMENT '活动发布人ID',
+  `read_count` int NULL DEFAULT 0 COMMENT '浏览量',
+  `cover` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '封面',
+  PRIMARY KEY (`id`) USING BTREE,
+  INDEX `fk_activity_publisher`(`publisher_id` ASC) USING BTREE,
+  CONSTRAINT `fk_activity_publisher` FOREIGN KEY (`publisher_id`) REFERENCES `activity_publisher` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE = InnoDB AUTO_INCREMENT = 21 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '活动' ROW_FORMAT = DYNAMIC;
+
+-- 触发器1
+-- 创建插入触发器
+-- 插入数据时验证日期
+CREATE TRIGGER before_activity_insert
+BEFORE INSERT ON `activity`
+FOR EACH ROW
+BEGIN
+    -- 比较 start 和 end 时间
+    IF STR_TO_DATE(NEW.`end`, '%Y-%m-%d') < STR_TO_DATE(NEW.`start`, '%Y-%m-%d') THEN
+        SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = '结束时间不能早于开始时间';
+    END IF;
+END;
+-- 触发器2
+-- 创建更新触发器
+-- 更新数据时验证日期
+CREATE TRIGGER before_activity_update
+BEFORE UPDATE ON `activity`
+FOR EACH ROW
+BEGIN
+    -- 比较 start 和 end 时间
+    IF STR_TO_DATE(NEW.`end`, '%Y-%m-%d') < STR_TO_DATE(NEW.`start`, '%Y-%m-%d') THEN
+        SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = '结束时间不能早于开始时间';
+    END IF;
+END;
+
+INSERT INTO `activity` (`id`, `name`, `descr`, `content`, `start`, `end`, `form`, `address`, `host`, `publisher_id`, `read_count`, `cover`)
+VALUES
+    (1, '科技大会', '一场关于最新科技趋势的研讨会', '<p>详细内容...</p>', '2024-10-01', '2024-11-03', '线下', '科技中心会议厅', '科技协会', 1, 5, 'http://example.com/cover.jpg'),
+    (2, '水下摄影大赛', '欢迎各位潜水爱好者参加水下摄影大赛，展现您的拍摄技巧！', '活动内容包含水下摄影技巧比赛、交流讲座等内容。', '2025-01-10', '2025-01-12', '线下', '海南三亚', '水下社区', 2, 0, 'cover1.jpg'),
+    (3, '珊瑚礁清理行动', '参加我们的珊瑚礁清理行动，保护美丽的海洋环境。', '大家将一起清理水下垃圾，并进行环境保护宣传。', '2025-02-05', '2025-02-07', '线下', '广东珠海', '珊瑚礁保护组织', 3, 0, 'cover2.jpg'),
+    (4, '海洋生物观察', '观察海洋生物，了解海洋生态。', '活动内容包括海洋生物观察、知识讲座等。', '2025-03-15', '2025-03-17', '线下', '福建厦门', '海洋生物研究会', 4, 0, 'cover3.jpg'),
+    (5, '环保讲座', '了解环保知识，保护地球家园。', '活动内容包括环保知识讲座、互动问答等。', '2025-04-20', '2025-04-22', '线下', '浙江杭州', '环保志愿者团队', 5, 0, 'cover4.jpg'),
+    (6, '潜水培训', '学习潜水技巧，探索神秘海底世界。', '活动内容包括潜水理论学习、实操练习等。', '2025-05-25', '2025-05-27', '线下', '江苏南京', '潜水培训中心', 6, 0, 'cover5.jpg'),
+    (7, '海洋科技展览', '展示最新的海洋科技成果。', '活动内容包括科技成果展览、互动体验等。', '2025-06-30', '2025-07-02', '线下', '湖北武汉', '海洋科技公司', 7, 0, 'cover6.jpg'),
+    (8, '海洋教育研讨会', '探讨海洋教育的重要性。', '活动内容包括研讨会、案例分享等。', '2025-07-15', '2025-07-17', '线下', '陕西西安', '海洋教育机构', 8, 0, 'cover7.jpg'),
+    (9, '海洋旅游节', '体验海洋旅游的乐趣。', '活动内容包括海洋旅游节、特色表演等。', '2025-08-20', '2025-08-22', '线下', '重庆', '海洋旅游公司', 9, 0, 'cover8.jpg'),
+    (10, '深海探险', '探索未知的深海世界。', '活动内容包括深海探险、科研交流等。', '2025-09-25', '2025-09-27', '线下', '深圳', '深海探险队', 10, 0, 'cover9.jpg');
+
+
+
+DROP TABLE IF EXISTS `activity_sign`;
+CREATE TABLE activity_sign (
+  id INT NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  activity_id INT NOT NULL COMMENT '活动ID',
+  user_id INT NOT NULL COMMENT '用户ID',
+  time varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '报名时间',
+  PRIMARY KEY (id) USING BTREE,
+  FOREIGN KEY (activity_id) REFERENCES activity(id) ON DELETE CASCADE ON UPDATE CASCADE,
+  FOREIGN KEY (user_id) REFERENCES user(id) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE = InnoDB AUTO_INCREMENT = 13 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '活动报名' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `activity_sign` (`activity_id`, `user_id`, `time`)
+VALUES
+    (1, 1, '2023-09-30 10:00:00'),
+    (2, 2, '2024-12-23 11:00:00'),
+    (4, 3, '2024-12-15 12:00:00'),
+    (7, 4, '2024-12-23 13:00:00'),
+    (10, 5, '2024-12-24 14:00:00'),
+    (9, 6, '2023-09-29 15:00:00'),
+    (6, 7, '2024-12-22 16:00:00'),
+    (8, 8, '2024-12-14 17:00:00'),
+    (5, 9, '2024-12-22 18:00:00'),
+    (9, 10, '2024-12-23 19:00:00');
+
+
+
+DROP TABLE IF EXISTS `category`;
+CREATE TABLE `category`  (
+  `id` int NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '分类名称',
+  PRIMARY KEY (`id`) USING BTREE,
+  UNIQUE INDEX `unique_category_name`(`name` ASC) USING BTREE
+) ENGINE = InnoDB AUTO_INCREMENT = 13 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '博客分类' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `category` (`id`, `name`)
+VALUES
+    (1, '科技'),
+    (2, '海洋'),
+    (3, '摄影'),
+    (4, '环保'),
+    (5, '生物'),
+    (6, '培训'),
+    (7, '教育'),
+    (8, '旅游'),
+    (10, '科学'),
+    (11, '探索'),
+    (12, '生态'),
+    (13, '活动'),
+    (14, '讲座');
+
+
+
+DROP TABLE IF EXISTS `blog`;
+CREATE TABLE `blog` (
+  `id` INT NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `title` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '标题',
+  `content` LONGTEXT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '内容',
+  `descr` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '简介',
+  `cover` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '封面',
+  `tags` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '标签',
+  `user_id` INT NOT NULL COMMENT '发布人ID',
+  `date` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '发布日期',
+  `read_count` INT NULL DEFAULT 0 COMMENT '浏览量',
+  `category_id` INT NOT NULL COMMENT '分类ID',
+  PRIMARY KEY (`id`) USING BTREE,
+  FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON DELETE CASCADE ON UPDATE CASCADE,
+  FOREIGN KEY (`category_id`) REFERENCES `category`(`id`) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE = InnoDB AUTO_INCREMENT = 30 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '博客信息' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `blog` (`id`, `title`, `content`, `descr`, `cover`, `tags`, `user_id`, `date`, `read_count`, `category_id`)
+VALUES
+    (1, '科技改变生活', '<p>科技如何改变我们的生活...</p>', '科技对生活的影响', 'cover1.jpg', '科技,生活', 1, '2023-09-01', 100, 1),
+    (2, '海洋保护的重要性', '<p>为什么保护海洋很重要...</p>', '海洋保护的重要性', 'cover2.jpg', '海洋,保护', 2, '2023-10-01', 150, 2),
+    (3, '水下摄影技巧', '<p>如何拍摄美丽的水下照片...</p>', '水下摄影技巧', 'cover3.jpg', '摄影,水下', 3, '2023-11-01', 200, 3),
+    (4, '珊瑚礁保护', '<p>如何保护珊瑚礁...</p>', '珊瑚礁保护', 'cover4.jpg', '珊瑚礁,保护', 4, '2023-12-01', 250, 4),
+    (5, '海洋生物观察', '<p>如何观察海洋生物...</p>', '海洋生物观察', 'cover5.jpg', '海洋生物,观察', 5, '2024-01-01', 300, 5),
+    (6, '环保知识', '<p>了解环保知识...</p>', '环保知识', 'cover6.jpg', '环保,知识', 6, '2024-02-01', 350, 4),
+    (7, '潜水培训', '<p>如何学习潜水...</p>', '潜水培训', 'cover7.jpg', '潜水,培训', 7, '2024-03-01', 400, 6),
+    (8, '海洋科技', '<p>最新的海洋科技成果...</p>', '海洋科技', 'cover8.jpg', '海洋,科技', 8, '2024-04-01', 450, 1),
+    (9, '海洋教育', '<p>海洋教育的重要性...</p>', '海洋教育', 'cover9.jpg', '教育,海洋', 9, '2024-05-01', 500, 7),
+    (10, '海洋旅游', '<p>如何体验海洋旅游...</p>', '海洋旅游', 'cover10.jpg', '旅游,海洋', 10, '2024-06-01', 550, 8);
+
+
+
+DROP TABLE IF EXISTS `collect`;
+CREATE TABLE `collect` (
+  `id` INT NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `fid` INT NOT NULL COMMENT '关联ID',  -- 关联ID，标识被收藏的内容
+  `user_id` INT NOT NULL COMMENT '收藏人ID',  -- 用户ID，标识收藏内容的用户
+  `module` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '模块',
+  PRIMARY KEY (`id`) USING BTREE,
+  FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE = InnoDB AUTO_INCREMENT = 50 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '收藏表' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `collect` (`fid`, `user_id`, `module`)
+VALUES
+    (2, 1, 'blog'),
+    (4, 2, 'blog'),
+    (1, 3, 'blog'),
+    (7, 4, 'blog'),
+    (6, 5, 'blog'),
+    (10, 6, 'blog'),
+    (3, 7, 'blog'),
+    (5, 8, 'blog'),
+    (8, 9, 'blog'),
+    (9, 10, 'blog');
+
+
+
+DROP TABLE IF EXISTS `comment`;
+CREATE TABLE `comment` (
+  `id` INT NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `content` VARCHAR(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '内容',
+  `user_id` INT NOT NULL COMMENT '评论人',
+  `pid` INT DEFAULT NULL COMMENT '父级ID',
+  `root_id` INT DEFAULT NULL COMMENT '根节点ID',
+  `time` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NULL DEFAULT NULL COMMENT '评论时间',
+  `fid` INT NOT NULL COMMENT '关联ID',
+  `module` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '模块',
+  PRIMARY KEY (`id`) USING BTREE,
+  FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON DELETE CASCADE ON UPDATE CASCADE,
+  FOREIGN KEY (`pid`) REFERENCES `comment`(`id`) ON DELETE CASCADE ON UPDATE CASCADE,
+  FOREIGN KEY (`root_id`) REFERENCES `comment`(`id`) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE = InnoDB AUTO_INCREMENT = 28 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '评论表' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `comment` (`id`, `content`, `user_id`, `pid`, `root_id`, `time`, `fid`, `module`)
+VALUES
+    (1, '非常有趣的文章！', 1, NULL, 1, '2023-09-02 10:00:00', 2, 'blog'),
+    (2, '谢谢分享！', 2, NULL, 2, '2023-10-02 11:00:00', 3, 'blog'),
+    (3, '很有启发！', 3, NULL, 3, '2023-11-02 12:00:00', 1, 'blog'),
+    (4, '非常有用的信息！', 4, NULL, 4, '2023-12-02 13:00:00', 10, 'blog'),
+    (5, '感谢作者！', 5, NULL, 5, '2024-01-02 14:00:00', 8, 'blog'),
+    (6, '非常详细！', 6, NULL, 6, '2024-02-02 15:00:00', 5, 'blog'),
+    (7, '很好的内容！', 7, NULL, 7, '2024-03-02 16:00:00', 6, 'blog'),
+    (8, '非常感谢！', 8, NULL, 8, '2024-04-02 17:00:00', 9, 'blog'),
+    (9, '很有帮助！', 9, NULL, 9, '2024-05-02 18:00:00', 4, 'blog'),
+    (10, '非常棒！', 10, NULL, 10, '2024-06-02 19:00:00', 10, 'blog');
+
+
+
+DROP TABLE IF EXISTS `likes`;
+CREATE TABLE `likes` (
+  `id` INT NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `fid` INT NOT NULL COMMENT '关联ID',
+  `user_id` INT NOT NULL COMMENT '点赞人ID',
+  `module` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '模块',
+  PRIMARY KEY (`id`) USING BTREE,
+  FOREIGN KEY (`user_id`) REFERENCES `user`(`id`) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE = InnoDB AUTO_INCREMENT = 62 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '点赞' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `likes` (`fid`, `user_id`, `module`)
+VALUES
+    (2, 1, 'blog'),
+    (6, 2, 'blog'),
+    (7, 3, 'blog'),
+    (9, 4, 'blog'),
+    (1, 5, 'blog'),
+    (3, 6, 'blog'),
+    (4, 7, 'blog'),
+    (10, 8, 'blog'),
+    (8, 9, 'blog'),
+    (5, 10, 'blog');
+
+
+
+DROP TABLE IF EXISTS `notice`;
+CREATE TABLE `notice` (
+  `id` INT NOT NULL AUTO_INCREMENT COMMENT 'ID',
+  `title` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '标题',
+  `content` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '内容',
+  `time` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '创建时间',  -- 修改为 NOT NULL
+  `user` VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT NULL COMMENT '创建人',
+  PRIMARY KEY (`id`) USING BTREE
+) ENGINE = InnoDB AUTO_INCREMENT = 6 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '公告信息表' ROW_FORMAT = DYNAMIC;
+
+INSERT INTO `notice` (`title`, `content`, `time`, `user`)
+VALUES
+    ('系统维护通知', '系统将于2024-12-31进行维护，预计持续2小时。', '2024-12-30', 'flyao'),
+    ('新年活动预告', '新年活动即将开始，详情请关注活动页面。', '2024-12-25', 'Yuki'),
+    ('重要安全更新', '请尽快更新您的密码以确保账户安全。', '2024-12-20', 'flyao'),
+    ('用户反馈收集', '我们正在收集用户反馈，请参与我们的问卷调查。', '2024-12-15', 'Yuki'),
+    ('活动延期通知', '原定于2024-12-18的活动延期至2025-01-01。', '2024-12-10', 'Yuki'),
+    ('系统升级通知', '系统将在2024-12-05进行升级，预计持续1小时。', '2024-12-04', 'flyao'),
+    ('活动报名提醒', '请尽快完成活动报名，名额有限。', '2024-11-30', 'admin1'),
+    ('新功能上线', '我们的新功能已上线，欢迎体验！', '2024-11-25', 'admin4'),
+    ('隐私政策更新', '我们更新了隐私政策，请查阅最新版本。', '2024-11-20', 'admin5'),
+    ('用户满意度调查', '我们正在进行用户满意度调查，期待您的宝贵意见。', '2024-11-15', 'admin6');
+
+
+
+-- 触发器3
+DELIMITER $$
+
+DROP TRIGGER IF EXISTS `after_blog_delete`;
+CREATE TRIGGER `after_blog_delete` 
+AFTER DELETE ON `blog`
+FOR EACH ROW
+BEGIN
+  -- 删除 collect 表中与删除的 blog 记录关联的记录
+  DELETE FROM `collect` WHERE `fid` = OLD.id AND `module` = 'blog';
+
+  -- 删除 likes 表中与删除的 blog 记录关联的记录
+  DELETE FROM `likes` WHERE `fid` = OLD.id AND `module` = 'blog';
+
+  -- 删除 comment 表中与删除的 blog 记录关联的记录
+  DELETE FROM `comment` WHERE `fid` = OLD.id AND `module` = 'blog';
+END $$
+
+DELIMITER ;
+
+
+
+-- 触发器4
+DELIMITER $$
+
+DROP TRIGGER IF EXISTS `after_activity_delete`;
+CREATE TRIGGER after_activity_delete
+AFTER DELETE ON `activity`
+FOR EACH ROW
+BEGIN
+    -- 删除 activity_sign 表中与删除的 activity 相关的记录
+    -- DELETE FROM `activity_sign` WHERE `activity_id` = OLD.id;
+    
+    -- 删除 collect 表中与删除的 activity 相关的记录
+    DELETE FROM `collect` WHERE `fid` = OLD.id AND `module` = 'activity';
+    
+    -- 删除 likes 表中与删除的 activity 相关的记录
+    DELETE FROM `likes` WHERE `fid` = OLD.id AND `module` = 'activity';
+    
+    -- 删除 comment 表中与删除的 activity 相关的记录
+    DELETE FROM `comment` WHERE `fid` = OLD.id AND `module` = 'activity';
+END$$
+
+DELIMITER ;
+
+
+
+-- 触发器5
+DELIMITER $$
+
+DROP TRIGGER IF EXISTS `after_admin_delete`;
+CREATE TRIGGER after_admin_delete
+AFTER DELETE ON `admin`
+FOR EACH ROW
+BEGIN
+    -- 删除 notice 表中与删除的 admin 用户相关的记录
+    DELETE FROM `notice` WHERE `user` = OLD.username;
+END$$
+
+DELIMITER ;
+
+
+
+-- 视图1
+-- 博客分类
+DROP VIEW IF EXISTS view_category_list;
+CREATE VIEW view_category_list AS
+SELECT 
+    id AS `序号`,
+    name AS `分类名称`
+FROM 
+    category;
+
+-- 视图2
+-- 博客信息
+DROP VIEW IF EXISTS blog_view;
+CREATE VIEW blog_view AS
+SELECT
+    b.id AS `序号`,
+    b.title AS `标题`,
+    b.descr AS `简介`,
+    b.cover AS `封面`,
+    c.name AS `分类`,
+    b.tags AS `标签`,
+    u.username AS `发布人`,
+    b.date AS `发布日期`,
+    b.read_count AS `浏览量`
+FROM blog b
+JOIN user u ON b.user_id = u.id
+JOIN category c ON b.category_id = c.id;
+
+-- 视图3
+-- 活动信息
+DROP VIEW IF EXISTS activity_view;
+CREATE VIEW activity_view AS
+SELECT
+    a.id AS `序号`,
+    a.name AS `活动名称`,
+    a.descr AS `活动简介`,
+    a.cover AS `封面`,
+    a.start AS `开始时间`,
+    a.end AS `结束时间`,
+    a.form AS `活动形式`,
+    a.address AS `活动地址`,
+    ap.name AS `活动发布人`,
+    a.host AS `主办方`,
+    a.read_count AS `浏览量`
+FROM activity a
+JOIN activity_publisher ap ON a.publisher_id = ap.id;
+
+-- 视图4
+-- 评论信息
+DROP VIEW IF EXISTS comment_view;
+CREATE VIEW comment_view AS
+SELECT
+    c.id AS `序号`,
+    c.content AS `内容`,
+    c.user_id AS `评论人ID`,
+    u.name AS `评论人`,
+    c.pid AS `父级ID`,
+    c.root_id AS `根节点ID`,
+    c.time AS `评论时间`,
+    c.fid AS `关联ID`,
+    c.module AS `模块`
+FROM comment c
+JOIN user u ON c.user_id = u.id;
+
+-- 视图5
+-- 活动报名信息
+DROP VIEW IF EXISTS activity_sign_view;
+CREATE VIEW activity_sign_view AS
+SELECT 
+    s.id AS `序号`,  
+    a.id AS `活动ID`,
+    a.name AS `活动名称`,
+    u.id AS `报名人ID`,
+    u.username AS `报名人`,
+    s.time AS `报名时间`
+FROM 
+    activity_sign s
+JOIN 
+    activity a ON s.activity_id = a.id
+JOIN 
+    user u ON s.user_id = u.id;
+
+-- 视图6
+-- 公告信息
+DROP VIEW IF EXISTS notice_view;
+CREATE VIEW notice_view AS
+SELECT 
+    n.id AS `序号`,
+    n.title AS `标题`,  
+    n.content AS `内容`,  
+    n.time AS `创建时间`,  
+    n.user AS `创建人`  
+FROM 
+    notice n;
+
+-- 视图7
+-- 管理员信息
+DROP VIEW IF EXISTS admin_view;
+CREATE VIEW admin_view AS
+SELECT 
+    ad.id AS `序号`,
+    ad.username AS `账号`,
+    ad.name AS `姓名`,
+    ad.phone AS `电话`,
+    ad.email AS `邮箱`,
+    ad.avatar AS `头像`,
+    ad.role AS `角色`
+FROM 
+    admin ad;
+
+-- 视图8
+-- 用户信息
+DROP VIEW IF EXISTS user_view;
+CREATE VIEW user_view AS
+SELECT 
+    u.id AS `序号`,
+    u.username AS `账号`,
+    u.name AS `姓名`,
+    u.phone AS `电话`,
+    u.email AS `邮箱`,
+    u.avatar AS `头像`,
+    u.sex AS `性别`,
+    u.info AS `个人简介`,
+    u.birth AS `生日`,
+    u.role AS `角色`
+FROM 
+    user u;
+
+-- 视图9
+-- 活动发布人信息
+DROP VIEW IF EXISTS activity_publisher_view;
+CREATE VIEW activity_publisher_view AS
+SELECT 
+    ap.id AS `序号`,
+    ap.username AS `账号`,
+    ap.name AS `姓名`,
+    ap.phone AS `电话`,
+    ap.email AS `邮箱`,
+    ap.organization AS `所在单位`,
+    ap.address AS `地址`, 
+    ap.avatar AS `头像`,
+    ap.role AS `角色`
+FROM 
+    activity_publisher ap;
+
+
+
+-- 权限设置
+-- 创建用户
+DROP USER IF EXISTS 'admin'@'localhost';
+CREATE USER 'admin'@'localhost' IDENTIFIED BY 'admin_password';
+DROP USER IF EXISTS 'user'@'localhost';
+CREATE USER 'user'@'localhost' IDENTIFIED BY 'user_password';
+DROP USER IF EXISTS 'activity_publisher'@'localhost';
+CREATE USER 'activity_publisher'@'localhost' IDENTIFIED BY 'activity_publisher_password';
+
+-- 分配管理员权限
+GRANT ALL PRIVILEGES ON mymanager.* TO 'admin'@'localhost';
+
+-- 分配普通用户权限
+GRANT SELECT ON mymanager.blog TO 'user'@'localhost';
+GRANT SELECT ON mymanager.comment TO 'user'@'localhost';
+GRANT SELECT ON mymanager.user TO 'user'@'localhost';
+GRANT INSERT ON mymanager.activity_sign TO 'user'@'localhost';
+GRANT INSERT ON mymanager.comment TO 'user'@'localhost';
+GRANT INSERT ON mymanager.collect TO 'user'@'localhost';
+GRANT UPDATE ON mymanager.user TO 'user'@'localhost';
+GRANT DELETE ON mymanager.comment TO 'user'@'localhost';
+GRANT DELETE ON mymanager.activity_sign TO 'user'@'localhost';
+
+-- 分配活动发布人权限
+GRANT SELECT, INSERT, UPDATE, DELETE ON mymanager.activity TO 'activity_publisher'@'localhost';
+
+-- 刷新权限
+FLUSH PRIVILEGES;
+
diff --git a/mysql/mymanager_delete.sql b/mysql/mymanager_delete.sql
new file mode 100644
index 0000000..50170f3
--- /dev/null
+++ b/mysql/mymanager_delete.sql
@@ -0,0 +1,66 @@
+-- 1. 删除活动报名记录
+-- 需求：删除用户 ID 为 5 报名的所有活动。
+DELETE FROM activity_sign
+WHERE user_id = 5;
+
+-- 2. 删除特定用户的评论
+-- 需求：删除用户 ID 为 8 所有的评论记录。（将ID改为用户名称，则该功能已经实现）
+DELETE FROM comment
+WHERE user_id = 8;
+
+-- 3. 删除过期的活动
+-- 需求：删除所有结束时间在当前时间之前的活动。
+DELETE FROM activity
+WHERE end < NOW();
+
+-- 4. 删除无效的博客
+-- 需求：删除所有浏览量为 0 且发布日期超过 1 年的博客。
+DELETE FROM blog
+WHERE read_count = 0 AND date < NOW() - INTERVAL 1 YEAR;
+
+-- 5. 删除发布人ID为2的活动
+-- 需求：删除发布人ID为2的活动。
+DELETE FROM activity
+WHERE publisher_id = 2;
+
+-- 6. 删除特定博客分类下的所有博客
+-- 需求：删除分类为 "深海探险" 的所有博客。
+DELETE FROM blog
+WHERE category_id = (SELECT id FROM category WHERE name = '深海探险');
+
+-- 7. 删除评论中的指定内容
+-- 需求：删除所有评论内容包含敏感词 "禁止" 的评论。
+DELETE FROM comment
+WHERE content LIKE '%非常%';
+
+-- 8. 删除用户的数据
+-- 需求：删除用户名为 testuser 的用户及其相关数据（包括博客、评论、收藏）。
+DELETE FROM blog
+WHERE user_id = (SELECT id FROM user WHERE username = 'testuser');
+DELETE FROM comment
+WHERE user_id = (SELECT id FROM user WHERE username = 'testuser');
+DELETE FROM collect
+WHERE user_id = (SELECT id FROM user WHERE username = 'testuser');
+DELETE FROM user
+WHERE username = 'testuser';
+
+-- 9. 删除过期的收藏记录
+-- 需求：删除所有收藏的活动或博客，如果它们对应的活动或博客已经被删除。
+DELETE FROM collect
+WHERE (fid, module) NOT IN (SELECT id, 'activity' FROM activity UNION SELECT id, 'blog' FROM blog);
+
+-- 10. 删除不活跃的用户
+-- 需求：删除没有任何活动（报名、评论等）的用户数据。
+DELETE FROM user
+WHERE id IN (
+    SELECT id
+    FROM (
+        SELECT u.id
+        FROM user u
+        LEFT JOIN activity_sign a ON u.id = a.user_id
+        LEFT JOIN comment c ON u.id = c.user_id
+        WHERE a.user_id IS NULL OR c.user_id IS NULL
+    ) AS temp_ids
+);
+
+
diff --git a/mysql/mymanager_select.sql b/mysql/mymanager_select.sql
new file mode 100644
index 0000000..1ec6473
--- /dev/null
+++ b/mysql/mymanager_select.sql
@@ -0,0 +1,134 @@
+-- 比较条件查询
+-- 查询需求 1: 查询所有活动的开始时间在 2024-01-01 之后的活动信息
+SELECT id, name, start, end, host
+FROM activity
+WHERE start > '2024-01-01';
+
+-- 查询需求 2: 查询所有用户的生日在 1990 年至 2000 年之间的用户信息。
+SELECT id, username, name, birth
+FROM user
+WHERE birth BETWEEN '1990-01-01' AND '2000-12-31';
+
+
+
+-- 集合比较查询
+-- 查询需求 3: 查询没有报名任何活动的用户信息。
+SELECT id, username, name
+FROM user
+WHERE id NOT IN (SELECT user_id FROM activity_sign);
+
+-- 查询需求 4: 查询所有已报名但尚未开始的活动的用户信息。
+SELECT u.id, u.username, u.name
+FROM user u
+WHERE u.id IN (
+    SELECT user_id
+    FROM activity_sign
+    WHERE activity_id IN (
+        SELECT id 
+        FROM activity 
+        WHERE start > NOW()
+    )
+);
+
+
+
+-- 范围比较查询
+-- 查询需求 5: 查询所有浏览量在 100 到 1000 之间的博客
+SELECT id, title, read_count
+FROM blog
+WHERE read_count BETWEEN 100 AND 1000;
+
+-- 查询需求 6: 查询所有活动的结束时间在当前时间前 30 天至 90 天之间的活动
+SELECT id, name, start, end
+FROM activity
+WHERE end BETWEEN NOW() - INTERVAL 90 DAY AND NOW() - INTERVAL 30 DAY;
+
+
+
+-- 字符串相似比较查询
+-- 查询需求 7: 查询所有包含 "海洋" 字样的博客标题
+SELECT id, title
+FROM blog
+WHERE title LIKE '%海洋%';
+
+-- 查询需求 8: 查询所有用户名包含 "潜水" 的用户信息
+SELECT id, username, name
+FROM user
+WHERE username LIKE '%潜水%';
+
+-- 多表连接查询
+-- 查询需求 9: 查询所有报名了活动的用户及其对应的活动信息
+SELECT u.username, u.name, a.name AS activity_name, a.start
+FROM user u
+JOIN activity_sign s ON u.id = s.user_id
+JOIN activity a ON s.activity_id = a.id;
+
+-- 查询需求 10: 查询所有博客及其所属分类名称
+SELECT b.title, c.name AS category_name
+FROM blog b
+JOIN category c ON b.category_id = c.id;
+
+-- 嵌套查询
+-- 查询需求 11: 查询所有用户的名字和邮箱，前提是该用户已报名了某个活动
+SELECT username, email
+FROM user
+WHERE id IN (SELECT user_id FROM activity_sign);
+
+-- 查询需求 12: 查询所有已发布的博客信息，前提是该博客所属的分类名称为 "水下摄影"
+SELECT title, content, date
+FROM blog
+WHERE category_id = (SELECT id FROM category WHERE name = '水下摄影');
+
+
+
+-- EXISTS 查询
+-- 查询需求 13: 查询所有有报名活动的用户信息。
+SELECT username, name
+FROM user u
+WHERE EXISTS (SELECT 1 FROM activity_sign s WHERE s.user_id = u.id);
+-- 查询需求 14: 查询所有有发布博客的用户信息。
+SELECT username, name
+FROM user u
+WHERE EXISTS (SELECT 1 FROM blog b WHERE b.user_id = u.id);
+
+-- 排序查询
+-- 查询需求 15: 查询浏览量最高的前 5 篇博客。
+SELECT id, title, read_count
+FROM blog
+ORDER BY read_count DESC
+LIMIT 5;
+
+-- 查询需求 16: 查询活动表中按活动开始时间升序排列的前 10 个活动。
+SELECT id, name, start, end
+FROM activity
+ORDER BY start ASC
+LIMIT 10;
+
+
+-- 聚合查询
+-- 查询需求 17: 查询每个活动的报名人数。
+SELECT a.name, COUNT(s.id) AS sign_up_count
+FROM activity a
+LEFT JOIN activity_sign s ON a.id = s.activity_id
+GROUP BY a.id;
+
+-- 查询需求 18: 查询每个分类下的博客数量。
+SELECT c.name AS category_name, COUNT(b.id) AS blog_count
+FROM category c
+LEFT JOIN blog b ON c.id = b.category_id
+GROUP BY c.id;
+
+
+
+-- 分组查询
+-- 查询需求 19: 查询每个用户参与的活动数量
+SELECT u.username, COUNT(s.id) AS sign_up_count
+FROM user u
+LEFT JOIN activity_sign s ON u.id = s.user_id
+GROUP BY u.id;
+
+-- 查询需求 20: 查询每个分类下平均的博客浏览量。
+SELECT c.name AS category_name, AVG(b.read_count) AS avg_read_count
+FROM category c
+LEFT JOIN blog b ON c.id = b.category_id
+GROUP BY c.id;
\ No newline at end of file
diff --git a/mysql/mymanager_update.sql b/mysql/mymanager_update.sql
new file mode 100644
index 0000000..af6e1ba
--- /dev/null
+++ b/mysql/mymanager_update.sql
@@ -0,0 +1,60 @@
+-- 1、更新用户的密码
+-- 将用户名为 user123 的用户密码修改为新的密码 newpassword123。
+UPDATE user
+SET password = 'newpassword123'
+WHERE username = 'user123';
+
+-- 2. 更新活动的主办方信息
+-- 需求：将活动 ID 为 3 的活动主办方更新为 深海探险俱乐部。
+UPDATE activity
+SET host = '深海探险俱乐部'
+WHERE id = 3;
+
+-- 3. 更新博客的浏览量
+-- 需求：将博客 ID 为 10 的博客的浏览量增加 100。
+UPDATE blog
+SET read_count = read_count + 100
+WHERE id = 10;
+
+-- 4. 更新用户的头像
+-- 需求：将用户名为 jack123 的用户头像修改为新的 URL。
+UPDATE user
+SET avatar = 'https://example.com/images/jack123_avatar.jpg'
+WHERE username = 'jack123';
+
+-- 5. 更新活动的结束时间
+-- 需求：将活动 ID 为 5 的活动结束时间修改为 2025-12-31。
+UPDATE activity
+SET end = '2025-12-31'
+WHERE id = 5;
+
+
+-- 6. 更新博客内容
+-- 需求：将博客 ID 为 7 的博客内容更新为新的文章内容。
+UPDATE blog
+SET content = '这是更新后的博客内容，包含新的视频和照片。'
+WHERE id = 7;
+
+-- 7. 更新用户的联系方式
+-- 需求：将用户 ID 为 3 的用户的电话修改为新的号码 13800001111。
+UPDATE user
+SET phone = '13800001111'
+WHERE id = 3;
+
+-- 8. 更新活动的封面图
+-- 需求：将活动 ID 为 8 的封面图修改为新的封面图片 URL。
+UPDATE activity
+SET cover = 'https://example.com/images/new_cover.jpg'
+WHERE id = 8;
+
+-- 9. 更新评论的内容
+-- 需求：将评论 ID 为 2 的评论内容修改为新的评论内容。
+UPDATE comment
+SET content = '这是更新后的评论内容，提出了更多问题。'
+WHERE id = 2;
+
+-- 10. 更新博客的标签
+-- 需求：将博客 ID 为 14 的博客标签更新为 ['水下摄影', '海洋探险']。
+UPDATE blog
+SET tags = '水下摄影, 海洋探险'
+WHERE id = 14;
\ No newline at end of file