MySQL 错误 1005？

Question

我正在尝试创建数据库，但出现了一个奇怪的错误...这是我的代码

DROP TABLE IF EXISTS `Person`;
DROP TABLE IF EXISTS `Address`;
DROP TABLE IF EXISTS `Email`;
DROP TABLE IF EXISTS `Airport`;
DROP TABLE IF EXISTS `Customer`;

CREATE TABLE Address
(
AddressID INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY(AddressID),
AddressStreet VARCHAR(255),
AddressCity VARCHAR(255),
AddressState VARCHAR(255),
AddressZip VARCHAR(255),
AddressCountry VARCHAR(255)
);


CREATE TABLE Email
(
EmailID INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY(EmailID),
EmailAddress VARCHAR(255)
);

CREATE TABLE Person
(
PersonID INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY(PersonID),
PersonCode VARCHAR(255),
PersonLastName VARCHAR(255),
PersonFirstName VARCHAR(255),
AddressID INT NOT NULL,
FOREIGN KEY `fk_Person_to_Address` (AddressID) REFERENCES Address(AddressID),
PersonPhone VARCHAR(255),
EmailID INT NOT NULL,
FOREIGN KEY `fk_Person_to_Email` (EmailID) REFERENCES Email(EmailID)
);

CREATE TABLE Airport
(
AirportID INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY(AirportID),
AirportCode VARCHAR(255),
AirportName VARCHAR(255),
AddressID INT NOT NULL,
FOREIGN KEY `fk_Airport_to_Address` (AddressID) REFERENCES Address(AddressID),
AirportLatDeg INT NOT NULL,
AirportLatMin INT NOT NULL,
AirportLongDeg INT NOT NULL,
AirportLongMin INT NOT NULL,
AirportPassFacilityFee FLOAT NOT NULL
);

CREATE TABLE Customer
(
CustomerID INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY(CustomerID),
CustomerCode VARCHAR(255),
CustomerType VARCHAR(255),
PrimaryContact VARCHAR(255),
FOREIGN KEY `fk_Customer_to_Person` (PrimaryContact) REFERENCES Person(PersonID),
CustomerName VARCHAR(255),
CustomerAirlineMiles FLOAT NOT NULL
);

一切顺利，直到我找到客户 table 并尝试重命名其中一个外键。这是我遇到的错误...

Error Code: 1005. Can't create table 'myName.Customer' (errno: 150)

我已尝试查看此错误的其他一些示例，但我不理解问题所在。是因为我正在尝试重命名 Customer table 中的外键吗？我想要的是从 Person table 获取 PersonID，但在 Customer table 中将其重命名为 primaryContact。我该如何解决这个问题？

Answer 1

创建外键时，数据类型应与主键相匹配。更改 Customer table 中的 PrimaryContact 字段以匹配 PersonId 的数据类型，在本例中为 int:

CREATE TABLE Customer
(
CustomerID INT NOT NULL AUTO_INCREMENT,
PRIMARY KEY(CustomerID),
CustomerCode VARCHAR(255),
CustomerType VARCHAR(255),
PrimaryContact int,
FOREIGN KEY `fk_Customer_to_Person` (PrimaryContact) REFERENCES Person(PersonID),
CustomerName VARCHAR(255),
CustomerAirlineMiles FLOAT NOT NULL
);

列的类型必须与标题为 Using FOREIGN KEY Constraints:

的手册页中所示的类型相同

Corresponding columns in the foreign key and the referenced key must have similar data types. The size and sign of integer types must be the same. The length of string types need not be the same. For nonbinary (character) string columns, the character set and collation must be the same.

MySQL 错误 1005？

MySQL Error 1005?

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