Add remote foreign key
CREATE TABLE `t2` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ext_id` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `ext_id` (`ext_id`),
CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`ext_id`) REFERENCES `boturbom`.`turbosturismos` (`iId`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;