CREATE TABLE `students` (
    `student_id` INT UNSIGNED UNIQUE NOT NULL AUTO_INCREMENT,
    `name` VARCHAR(30) NOT NULL
);

CREATE TABLE `exams` (
    `exam_id` INT UNSIGNED UNIQUE NOT NULL AUTO_INCREMENT,
    `name` VARCHAR(30) NOT NULL
) AUTO_INCREMENT=101;

CREATE TABLE `students_exams` (
    `student_id` INT UNSIGNED NOT NULL,
    `exam_id` INT UNSIGNED NOT NULL
);

INSERT
    INTO `students`
        (`name`)
    VALUES
        ('Mila'),
        ('Toni'),
        ('Ron');

INSERT
    INTO `exams`
        (`name`)
    VALUES
        ('Spring MVC'),
        ('Neo4j'),
        ('Oracle 11g');

INSERT
    INTO `students_exams`
    VALUES
        (1, 101),
        (1, 102),
        (2, 101),
        (3, 103),
        (2, 102),
        (2, 103);

ALTER TABLE `students`
    ADD CONSTRAINT `pk_students`
        PRIMARY KEY (`student_id`);

ALTER TABLE `exams`
    ADD CONSTRAINT `pk_exams`
        PRIMARY KEY (`exam_id`);

ALTER TABLE `students_exams`
    ADD CONSTRAINT `pk_students_exams`
        PRIMARY KEY (`student_id`, `exam_id`),
    ADD CONSTRAINT `fk_students_exams_students`
        FOREIGN KEY (`student_id`)
        REFERENCES `students` (`student_id`),
    ADD CONSTRAINT `fk_students_exams_exams`
        FOREIGN KEY (`exam_id`)
        REFERENCES `exams` (`exam_id`);