38 lines
1.6 KiB
SQL
38 lines
1.6 KiB
SQL
-- =============================================
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-- Week 4：学生管理系统 v1 数据库初始化
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-- =============================================
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CREATE DATABASE IF NOT EXISTS week4_student
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DEFAULT CHARACTER SET utf8mb4
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DEFAULT COLLATE utf8mb4_unicode_ci;
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USE week4_student;
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DROP TABLE IF EXISTS student;
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CREATE TABLE student (
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id BIGINT NOT NULL AUTO_INCREMENT COMMENT '主键ID',
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name VARCHAR(20) NOT NULL COMMENT '姓名',
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age INT NOT NULL COMMENT '年龄',
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email VARCHAR(50) NOT NULL COMMENT '邮箱',
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score INT NOT NULL DEFAULT 0 COMMENT '成绩 0-100',
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avatar VARCHAR(200) COMMENT '头像文件名',
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create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
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update_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
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PRIMARY KEY (id),
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INDEX idx_name (name),
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INDEX idx_score (score)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='学生表';
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INSERT INTO student (name, age, email, score, avatar) VALUES
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('张三', 20, 'zhangsan@mail.com', 85, NULL),
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('李四', 22, 'lisi@mail.com', 92, NULL),
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('王五', 19, 'wangwu@mail.com', 78, NULL),
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('赵六', 21, 'zhaoliu@mail.com', 88, NULL),
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('孙七', 23, 'sunqi@mail.com', 95, NULL),
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('周八', 20, 'zhouba@mail.com', 73, NULL),
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('吴九', 22, 'wujiu@mail.com', 81, NULL),
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('郑十', 21, 'zhengshi@mail.com',90, NULL);
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SELECT COUNT(*) AS total_students FROM student;
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