0
我在Ubuntu 16.04 LTS上遇到Navicat問題,我正在嘗試執行腳本,並且它在最後一張表上表示不能添加外鍵約束,這裏是我的腳本,有誰知道我在哪裏錯了?MySQL不會將外鍵多於一個外鍵添加到同一個表
感謝諮詢
這裏是我的SQL腳本:
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`)
);
以下是錯誤消息:
[Err] 1215 - Cannot add foreign key constraint
粘貼確切的錯誤信息呢? –
林不知道,但它可能是兩個不同的外鍵對一個和同一個表'Studenti'是不允許的(至少不是所有的MySQL版本)。如果刪除其中一個約束,您是否仍然遇到同樣的錯誤?例如,嘗試刪除行'CONSTRAINT FK_Prijave_Upisan FOREIGN KEY(Upisan)REFERENCES Studenti(Upisan)',並讓我們知道如果錯誤仍然存在... –
當我刪除該約束時,它也可以工作 – tehnodrom