mysql - 无法添加外键 SQL fiddle

Question

我的表中的外键有问题。如果有人能指出错误，请指出，我不知道它是什么。

CREATE TABLE IF NOT EXISTS `user_account` (
  `accountID` int(10) UNSIGNED NOT NULL AUTO_INCREMENT, 
  `username` VARCHAR(20) NOT NULL,
  `typeID` int(10) UNSIGNED NOT NULL,
  `email` VARCHAR(100) NOT NULL,
  `password` VARCHAR(100) NOT NULL,
  PRIMARY KEY (`accountID`),
  FOREIGN KEY (`typeID`) REFERENCES account_type(`typeID`)
) ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS `account_type`(
  `typeID` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `typeName` VARCHAR (20) NOT NULL,
  `description` VARCHAR (255),
  PRIMARY KEY (`typeID`),
) ENGINE = InnoDB;

就我而言，我的数据类型很好。

感谢您的帮助。

Answer 1

修复下面第一个表中的拼写错误额外逗号后，只需按相反的顺序执行即可。

CREATE TABLE IF NOT EXISTS `account_type`(
  `typeID` int(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  `typeName` VARCHAR (20) NOT NULL,
  `description` VARCHAR (255),
  PRIMARY KEY (`typeID`)
) ENGINE = InnoDB;


CREATE TABLE IF NOT EXISTS `user_account` (
  `accountID` int(10) UNSIGNED NOT NULL AUTO_INCREMENT, 
  `username` VARCHAR(20) NOT NULL,
  `typeID` int(10) UNSIGNED NOT NULL,
  `email` VARCHAR(100) NOT NULL,
  `password` VARCHAR(100) NOT NULL,
  PRIMARY KEY (`accountID`),
  FOREIGN KEY (`typeID`) REFERENCES account_type(`typeID`)
) ENGINE = InnoDB;