CREATE TABLE `users` (
 `user_id` int(11) NOT NULL AUTO_INCREMENT,
 `username` varchar(255) NOT NULL,
 PRIMARY KEY (`user_id`)
);


CREATE TABLE `forum_users` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `user_id` int(11) NOT NULL,
 `forum_username` varchar(255) NOT NULL,
 PRIMARY KEY (`id`)
);


INSERT INTO users
    (user_id,username)
VALUES
    (23,'mycoolname666'),
    (36,'killername');


INSERT INTO forum_users
    (id,user_id,forum_username)
VALUES
    (1,23,'randomname123'),
    (2,36,'namethatisrandom');