錯誤代碼：1215無法添加新的外鍵約束

Question

這是我使用的查詢：

alter table publication1 add foreign key (Venuekey) references publicationvenue.venueKey

和下面是該查詢的兩個表：

出版表：

CREATE TABLE `publication1` 
(

`keypub` varchar(200) CHARACTER SET latin1 COLLATE latin1_general_cs NOT NULL, 

`title` varchar(700) DEFAULT NULL, 

`booktitle` varchar(250) DEFAULT NULL, 

`journal` varchar(250) DEFAULT NULL, 

`volume` varchar(50) CHARACTER SET latin1 DEFAULT NULL, 

`month` varchar(50) CHARACTER SET latin1 DEFAULT NULL, 

    `year` varchar(50) CHARACTER SET latin1 DEFAULT NULL, 

    `cdrom` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `ee` varchar(500) CHARACTER SET latin1 DEFAULT NULL, 

    `publisher` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `pages` varchar(50) CHARACTER SET latin1 DEFAULT NULL, 

    `number` varchar(50) CHARACTER SET latin1 DEFAULT NULL, 

    `url` varchar(500) CHARACTER SET latin1 DEFAULT NULL, 

    `cite` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `address` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `note` varchar(500) CHARACTER SET latin1 DEFAULT NULL, 

    `isbn` varchar(50) CHARACTER SET latin1 DEFAULT NULL, 

    `series` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `school` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `chapter` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `crossref` varchar(250) CHARACTER SET latin1 DEFAULT NULL, 

    `type` varchar(30) CHARACTER SET latin1 DEFAULT NULL, 

    `venueClean` varchar(250) DEFAULT NULL, 

    `venuekey` varchar(200) DEFAULT NULL, 

    PRIMARY KEY (`keypub`), 

    KEY `venue_index` (`venueClean`) 

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='InnoDB free: 49152 kB; 

    InnoDB free: 5424128 kB'; 

而第二個表我小號PublicationVenue：

CREATE TABLE `publicationvenue` (

    `venuekey` varchar(200) NOT NULL, 

    `VenueName` varchar(1000) DEFAULT NULL, 

    PRIMARY KEY (`venuekey`) 

) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

我已經設置了默認字符集相同的兩個表和列，並完成了所有諸如此類的事情，但仍然無法解決此查詢，請幫助？

Answer 1

foreign key語法是錯誤的，可以使用如下：

ALTER TABLE publication1 ADD foreign key (Venuekey) 
    references publicationvenue(venueKey);