CREATE TABLE IF NOT EXISTS `user_skills` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `user_id` int(11) unsigned NOT NULL,
    `skill_id` int(11) NOT NULL,
    `progress` INT DEFAULT 0,
    FOREIGN KEY (user_id) REFERENCES users(id),
    FOREIGN KEY (skill_id) REFERENCES skills(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;