User and game database many-to-many connection - mysql

Question

I'm trying to create a game database. I have already created a user table where the users, password and email are stored.
CREATE TABLE `users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) DEFAULT NULL,
`password` char(40) DEFAULT NULL,
`email` varchar(60) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=111 DEFAULT CHARSET=utf8;
I have also created a games table where the game type, name of the game, duration, description, active and who has created the game.
CREATE TABLE `games` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`type` varchar(30) DEFAULT NULL,
`name` varchar(60) DEFAULT NULL,
`duration` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`description` varchar(255) DEFAULT NULL,
`Active` tinyint(1) DEFAULT NULL,
`Completed` tinyint(1) DEFAULT NULL,
`createdBy` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=utf8;
The users will be able to create a game and invite x number of users, hence it will be a many-to-many relations. I have tried to create a table called active_games but I'm not sure how I should proceed. I need a connection so that I know who has created the game and who is playing that game.
CREATE TABLE `active_games` (
`user_id` int(11) NOT NULL DEFAULT '0',
`game_id` int(11) NOT NULL DEFAULT '0',
PRIMARY KEY (`user_id`,`game_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
What would be the next step? If a user creates a game and sends the "invite" to other friends, is it possible to automatically assign a game ID and the users invited to the that game ID? And if I want to find all the active games for a specific user, how can I do that?

Answer 1

You need two more tables. UserGames would have information about users who create games:
CREATE TABLE UserGames (
UserGameId int not null auto_increment primary key,
userid int NOT NULL references users(id),
gameid int not null references games(id),
CreationDate datetime,
. . .
);
And GameInvites:
CREATE TABLE GameInvites (
GameInviteId int not null auto_increment primary key,
UserGamesId int not null references UserGames(UserGamesId),
invited_userid int NOT NULL references users(id),
AcceptedFlag bit
. . .
);
The . . . represent additional information that might want to store about each relationship.