Question

我正在完成作业并遇到错误，其中一个是外键。

第一张表：

CREATE TABLE MANUFACTURERS
(
Manufacturers_ID int(5) UNIQUE,
Name varchar(15) UNIQUE,
City varchar(30),
State char(2),
Zip char(5),
Phone char(10),
PRIMARY KEY (Manufacturers_ID)
)
ENGINE= innodb;

第二张表

CREATE TABLE OWNERS
(
Owner_ID int(10),
First_Name varchar(15),
Last_Name varchar(15),
City varchar(30),
State char(2),
Gender varchar(1),
Date_of_Birth varchar(10),
PRIMARY KEY (Owner_ID)
)
ENGINE= innodb;

第三表

CREATE TABLE CARS
(
Vehicle_Identification_Number int(17) NOT NULL UNIQUE,
Manufacturers_ID int(5) UNIQUE,
Owner_ID int(10) UNIQUE,
Model varchar(25),
Manufaturer_Year int(4),
Mileage int(10),
Price int(10),
PRIMARY KEY (Vehicle_Identification_Number),
FOREIGN KEY (Manufacturers_ID) REFERENCES MANUFACTURERS (Manufactures_ID),
FOREIGN KEY (Owner_ID) REFERENCES OWNERS (Owner_ID)
)
ENGINE= innodb;

当我尝试执行第三个表时，我收到消息：

＆＃34;执行SQL命令时发生错误。

错误：无法创建表格＆＃39; ds0004.CARS＆＃39; （错误：150）＆＃34;

非常感谢任何帮助。

Answer 1

您在CARS中错误拼写了外国参考文献。这是正确的版本：

CREATE TABLE CARS
(
Vehicle_Identification_Number int(17) NOT NULL UNIQUE,
Manufacturers_ID int(5) ,
Owner_ID int(10) ,
Model varchar(25),
Manufaturer_Year int(4),
Mileage int(10),
Price int(10),
PRIMARY KEY (Vehicle_Identification_Number),
FOREIGN KEY (Manufacturers_ID) REFERENCES MANUFACTURERS (Manufacturers_ID),
--------------------------------------------------------------------^
FOREIGN KEY (Owner_ID) REFERENCES OWNERS (Owner_ID)
)

不能制作2个外键，＆＃34;错误：150＆＃34;

1 个答案: