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我在Ubuntu 16.04 LTS上遇到Navicat问题,我正在尝试执行脚本,并且它在最后一张表上表示不能添加外键约束,这里是我的脚本,有谁知道我在哪里错了?MySQL不会将外键多于一个外键添加到同一个表
感谢咨询
这里是我的SQL脚本:
CREATE TABLE `SMER` (
`Ssmer` INT(10) NOT NULL AUTO_INCREMENT,
`Nazivs` VARCHAR(255) NOT NULL,
PRIMARY KEY (`Ssmer`)
);
CREATE TABLE `Nastavnici` (
`Snast` INT(10) NOT NULL AUTO_INCREMENT,
`Imen` VARCHAR(255) NOT NULL,
PRIMARY KEY (`Snast`)
);
CREATE TABLE `PREDMETI` (
`SPRED` INT(10) NOT NULL AUTO_INCREMENT,
`NAZIVP` VARCHAR(255) NOT NULL,
PRIMARY KEY (`SPRED`)
);
CREATE TABLE `Studenti` (
`Indeks` INT(10) NOT NULL,
`Upisan` INT(10) NOT NULL,
`Imes` VARCHAR(255) NOT NULL,
`Mesto` VARCHAR(255),
`Datr` DATETIME NOT NULL,
`Ssmer` INT(10) NOT NULL,
PRIMARY KEY (`Indeks`, `Upisan`),
CONSTRAINT `FK_Studenti_Ssmer` FOREIGN KEY (`Ssmer`) REFERENCES `SMER` (`Ssmer`)
);
CREATE TABLE `USLOVNI` (
`Spred` INT(10) NOT NULL,
`UslPredmet` INT(10) NOT NULL,
PRIMARY KEY (`Spred`, `UslPredmet`),
CONSTRAINT `FK_Uslovni_Spred` FOREIGN KEY (`Spred`) REFERENCES `PREDMETI` (`SPRED`),
CONSTRAINT `FK_Uslovni_UslPredmet` FOREIGN KEY (`UslPredmet`) REFERENCES `PREDMETI` (`SPRED`)
);
CREATE TABLE `Planst` (
`Ssmer` INT(10) NOT NULL,
`Spred` INT(10) NOT NULL,
`Semestar` VARCHAR(255) DEFAULT NULL,
PRIMARY KEY (`Ssmer`, `Spred`),
CONSTRAINT `FK_Planst_Ssmer` FOREIGN KEY (`Ssmer`) REFERENCES `SMER` (`Ssmer`),
CONSTRAINT `FK_Planst_Spred` FOREIGN KEY (`Spred`) REFERENCES `PREDMETI` (`SPRED`)
);
CREATE TABLE `Angazovanje` (
`Snast` INT(10) NOT NULL,
`Spred` INT(10) NOT NULL,
`Ssmer` INT(10) NOT NULL,
PRIMARY KEY (`Snast`, `Spred`, `Ssmer`),
CONSTRAINT `FK_Angazovanje_Snast` FOREIGN KEY (`Snast`) REFERENCES `Nastavnici` (`Snast`),
CONSTRAINT `FK_Angazovanje_Spred` FOREIGN KEY (`Spred`) REFERENCES `PREDMETI` (`SPRED`),
CONSTRAINT `FK_Angazovanje_Ssmer` FOREIGN KEY (`Ssmer`) REFERENCES `SMER` (`Ssmer`)
);
CREATE TABLE `Prijave` (
`Spred` INT(10) NOT NULL,
`Indeks` INT(10) NOT NULL,
`Upisan` INT(10) NOT NULL,
`Snast` INT(10) NOT NULL,
`Datump` DATETIME DEFAULT NOW(),
`Ocena` INT(2) NOT NULL,
PRIMARY KEY (`Spred`, `Indeks`, `Upisan`, `Datump`),
CONSTRAINT `FK_Prijave_Spred` FOREIGN KEY (`Spred`) REFERENCES `PREDMETI` (`SPRED`),
CONSTRAINT `FK_Prijave_Indeks` FOREIGN KEY (`Indeks`) REFERENCES `Studenti` (`Indeks`),
CONSTRAINT `FK_Prijave_Upisan` FOREIGN KEY (`Upisan`) REFERENCES `Studenti` (`Upisan`),
CONSTRAINT `FK_Prijave_Snast` FOREIGN KEY (`Snast`) REFERENCES `Nastavnici` (`Snast`)
);
以下是错误消息:
[Err] 1215 - Cannot add foreign key constraint
粘贴确切的错误信息呢? –
林不知道,但它可能是两个不同的外键对一个和同一个表'Studenti'是不允许的(至少不是所有的MySQL版本)。如果删除其中一个约束,您是否仍然遇到同样的错误?例如,尝试删除行'CONSTRAINT FK_Prijave_Upisan FOREIGN KEY(Upisan)REFERENCES Studenti(Upisan)',并让我们知道如果错误仍然存在... –
当我删除该约束时,它也可以工作 – tehnodrom