如何创建适用于学校管理系统的MySQL表结构？

CREATE TABLE IF NOT EXISTS school_info (
    school_id INT(11) PRIMARY KEY AUTO_INCREMENT,
    school_name VARCHAR(100) NOT NULL,
    address VARCHAR(200) NOT NULL,
    phone VARCHAR(20) NOT NULL
);

CREATE TABLE IF NOT EXISTS class_info (
    class_id INT(11) PRIMARY KEY AUTO_INCREMENT,
    class_name VARCHAR(50) NOT NULL,
    school_id INT(11) NOT NULL,
    FOREIGN KEY (school_id) REFERENCES school_info(school_id)
);

CREATE TABLE IF NOT EXISTS student_info (
    student_id INT(11) PRIMARY KEY AUTO_INCREMENT,
    student_name VARCHAR(50) NOT NULL,
    gender ENUM('男', '女') NOT NULL,
    birthday DATE NOT NULL,
    class_id INT(11) NOT NULL,
    FOREIGN KEY (class_id) REFERENCES class_info(class_id)
);

CREATE TABLE IF NOT EXISTS teacher_info (
    teacher_id INT(11) PRIMARY KEY AUTO_INCREMENT,
    teacher_name VARCHAR(50) NOT NULL,
    gender ENUM('男', '女') NOT NULL,
    birthday DATE NOT NULL,
    school_id INT(11) NOT NULL,
    FOREIGN KEY (school_id) REFERENCES school_info(school_id)
);

CREATE TABLE IF NOT EXISTS course_info (
    course_id INT(11) PRIMARY KEY AUTO_INCREMENT,
    course_name VARCHAR(100) NOT NULL,
    teacher_id INT(11) NOT NULL,
    FOREIGN KEY (teacher_id) REFERENCES teacher_info(teacher_id)
);

CREATE TABLE IF NOT EXISTS score_info (
    student_id INT(11) NOT NULL,
    course_id INT(11) NOT NULL,
    score FLOAT NOT NULL,
    PRIMARY KEY (student_id, course_id),
    FOREIGN KEY (student_id) REFERENCES student_info(student_id),
    FOREIGN KEY (course_id) REFERENCES course_info(course_id)
);