mySql外键名称问题

mySql foreign key name issue

嗨，我在mysql workbench中设计了一个数据库。当我去转发工程师的时候，我得到了(错误号：121)，因为我在多个表中都有相同的外键，我意识到这是不允许的。我有很多联结表，因为大多数是n：m关系。我使用复合主键(由2个外键组成)用于大多数这些连接表。我的问题是，我是否必须将这些主键重命名为与外键一起使用？
请欣赏一些帮助。

(我还没有在下面的代码中重命名外键)

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CREATE TABLE IF NOT EXISTS `mydb`.`tblStudent` (
`StudentID` INT(6) NOT NULL AUTO_INCREMENT ,
`Student_Firstname` VARCHAR(20) NOT NULL ,
`Student_Lastname` VARCHAR(20) NOT NULL ,
`DOB` DATE NOT NULL ,
`Student_Gender` ENUM('Male','Female') NOT NULL ,
`Student_Address1` VARCHAR(40) NOT NULL ,
`Student_Address2` VARCHAR(22) NOT NULL ,
`Student_Address3` VARCHAR(14) NOT NULL ,
`Student_Phonenum` INT(10) NULL ,
`Student_Email` VARCHAR(60) NOT NULL ,
`Student_Password` CHAR(128) NOT NULL ,
`Enrollment_Date` DATE NOT NULL ,
`Graduation_Date` DATE NULL ,
`Student_Picture` VARCHAR(100) NOT NULL ,
`PPSN` VARCHAR(9) NOT NULL ,
PRIMARY KEY (`StudentID`) )
ENGINE = InnoDB

CREATE TABLE IF NOT EXISTS `mydb`.`tblIllness` (
`IllnessID` CHAR(5) NOT NULL ,
`Illness_Name` VARCHAR(30) NOT NULL ,
PRIMARY KEY (`IllnessID`) )
ENGINE = InnoDB

CREATE TABLE IF NOT EXISTS `mydb`.`tblStudentIllness` (
`IllnessID` CHAR(5) NOT NULL ,
`StudentID` INT(6) NOT NULL ,
`Doctor_Name` VARCHAR(30) NOT NULL ,
`Doctor_Phonenum` INT(10) NOT NULL ,
`Medication` VARCHAR(40) NOT NULL ,
`Medical_Advice` VARCHAR(250) NOT NULL ,
PRIMARY KEY (`IllnessID`, `StudentID`) ,
INDEX `IllnessID_idx` (`IllnessID` ASC) ,
INDEX `StudentID_idx` (`StudentID` ASC) ,
CONSTRAINT `IllnessID`
FOREIGN KEY (`IllnessID` )
REFERENCES `mydb`.`tblIllness` (`IllnessID` )
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT `StudentID`
FOREIGN KEY (`StudentID` )
REFERENCES `mydb`.`tblStudent` (`StudentID` )
ON DELETE CASCADE
ON UPDATE CASCADE)
ENGINE = InnoDB

这对我来说很好。一种解决方案是只删除约束名称，它们将自动为您生成。

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...
CONSTRAINT
FOREIGN KEY (`IllnessID` )
REFERENCES `tblIllness` (`IllnessID` )
ON DELETE CASCADE
ON UPDATE CASCADE,
CONSTRAINT
FOREIGN KEY (`StudentID` )
REFERENCES `tblStudent` (`StudentID` )
ON DELETE CASCADE
...