如何创建数据到连接表中的多对多关系而不创建数据到连接点中

CREATE TABLE students (
    student_id INT PRIMARY KEY,
    name VARCHAR(100)
);

CREATE TABLE courses (
    course_id INT PRIMARY KEY,
    title VARCHAR(100)
);

CREATE TABLE student_courses (
    student_id INT,
    course_id INT,
    PRIMARY KEY (student_id, course_id),
    FOREIGN KEY (student_id) REFERENCES students(student_id),
    FOREIGN KEY (course_id) REFERENCES courses(course_id)
);

-- 插入学生数据
INSERT INTO students (student_id, name) VALUES (1, 'Alice');
INSERT INTO students (student_id, name) VALUES (2, 'Bob');

-- 插入课程数据
INSERT INTO courses (course_id, title) VALUES (101, 'Mathematics');
INSERT INTO courses (course_id, title) VALUES (102, 'Physics');

-- 插入学生选课关系
INSERT INTO student_courses (student_id, course_id) VALUES (1, 101);
INSERT INTO student_courses (student_id, course_id) VALUES (1, 102);
INSERT INTO student_courses (student_id, course_id) VALUES (2, 101);