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第1005号法令 MySQL错误,不能确定为什么
原标题:Getting 1005 MySQL error, not sure why

我正试图建立数据库表并连接这些表格。 我确保我的数据类型相同。 我也确保,我的表格在加入科索沃信托公司之前进行。 任何建议都将受到高度赞赏。

SQL query:

ALTER TABLE `Member` ADD FOREIGN KEY ( memberId ) REFERENCES `Order_Head` ( `memberId` ) ;

MySQL said: Documentation
#1005 - Can t create table  test2.#sql-184c_63  (errno: 150) (Details...) 





-- ---
-- Table  Order_Head 
-- 
-- ---

DROP TABLE IF EXISTS `Order_Head`;

CREATE TABLE `Order_Head` (
  `orderId` INTEGER NOT NULL AUTO_INCREMENT,
  `memberId` INTEGER NOT NULL,
  `date` DATE NOT NULL,
  PRIMARY KEY (`orderId`, `memberId`)
);

-- ---
-- Table  Member 
-- 
-- ---

DROP TABLE IF EXISTS `Member`;

CREATE TABLE `Member` (
  `memberId` INTEGER NOT NULL AUTO_INCREMENT,
  `userName` VARCHAR(50) NOT NULL,
  `password` VARCHAR(50) NOT NULL,
  `email` VARCHAR(100) NOT NULL,
  `isAdmin` BOOLEAN NOT NULL DEFAULT false,
  PRIMARY KEY (`memberId`)
);

-- ---
-- Foreign Keys 
-- ---

ALTER TABLE `Member` ADD FOREIGN KEY (memberId) REFERENCES `Order_Head` (`memberId`);

-- ---
-- Table Properties
-- ---
ALTER TABLE `Order_Head` ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
ALTER TABLE `Member` ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
最佳回答

这可能是因为你试图建立外国钥匙是主要的关键,并且有<代码>。 缩略语

ALTER TABLE `Order_Head` ADD FOREIGN KEY (memberId) REFERENCES `Member` (`memberId`);

您认为没有在<代码>内建立外国钥匙的任何特殊理由 CREATE TABLE statement? 否则,你也应当这样做。

问题回答

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