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Question for the #MySQL / #MariaDB buffs, I have three tables defined thus:

CREATE TABLE IF NOT EXISTS `user` (
	`uid` mediumint unsigned NOT NULL auto_increment COMMENT 'sequential ID',
	...
	 PRIMARY KEY(`uid`)
);
CREATE TABLE IF NOT EXISTS `gserver` (
	`id` int unsigned NOT NULL auto_increment COMMENT 'sequential ID',
	...
	 PRIMARY KEY(`id`)
);

CREATE TABLE IF NOT EXISTS `user-gserver` (
	`uid` mediumint unsigned NOT NULL DEFAULT 0 COMMENT 'Owner User id',
	`gsid` mediumint unsigned NOT NULL DEFAULT 0 COMMENT 'Gserver id',
	...
	PRIMARY KEY(`uid`,`gsid`),
	FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON UPDATE RESTRICT ON DELETE CASCADE,
	FOREIGN KEY (`gsid`) REFERENCES `gserver` (`id`) ON UPDATE RESTRICT ON DELETE CASCADE
);