外键约束的格式不正确? [英] Foreign key constraint is incorrectly formed?

问题描述

创建表时出现此错误:外键约束格式不正确?

I got this errore 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;
}

我删除fk_3没关系
这是我的笔记表

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
}

感谢帮助！

推荐答案

这是因为notes表的主键是(Dev_ID,Note_ID)，但是您在约束中仅引用了其中一列(Note_ID).

That's because the primary key of the notes table is (Dev_ID,Note_ID) but you are only referencing one of those columns (Note_ID) in your constraint.

FK约束必须始终由所有PK列组成.

A FK constraint must always consist of all PK columns.

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