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I got this error when create table: Foreign key constraint is incorrectly formed ? create table comment( Comment_ID int UNSIGNED AUTO_INCREMENT not null, User_1 varchar(50) not null, Note_ID int(11) UNSIGNED not null, PRIMARY key(Comment_ID), CONSTRAINT `fk_1` FOREIGN KEY (`User_1`) REFERENCES `user` (`Dev_ID`), CONSTRAINT `fk_2` FOREIGN KEY (`User_2`) REFERENCES `user` (`Dev_ID`), CONSTRAINT `fk_3` FOREIGN KEY (`Note_ID`) REFERENCES `note`(`Note_ID`) )ENGINE=InnoDB DEFAULT CHARSET=utf8; it's OK when I remove fk_3 . This my note table CREATE TABLE `note` ( `Dev_ID` varchar(50) NOT NULL, `Note_ID` int(11) UNSIGNED NOT NULL, `Title` varchar(200) NOT NULL, `Time` datetime NOT NULL, `Mood` int(11) NOT NULL, `Body` varchar(3000) NOT NULL, `Visible` tinyint(1) NOT NULL DEFAULT '1', `Share` tinyint(1) NOT NULL DEFAULT '0', `Update` tinyint(1) NOT NULL DEFAULT '0', PRIMARY KEY (`Dev_ID`,`Note_ID`), CONSTRAINT `fk_note_user` FOREIGN KEY (`Dev_ID`) REFERENCES `user` (`Dev_ID`) ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8 Thanks for help!

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