我一直收到以下错误：
介绍FOREIGN KEY约束＆＃39; FK_Zipcode2＆＃39;在桌子上
Employee＆＃39;可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION，或修改其他FOREIGN KEY约束。
我做错了什么？这是我的代码：
USE Master
/*If a "Richardson_LAR" database already exists, drop it.*/
IF EXISTS(SELECT * FROM sysdatabases WHERE name = 'Richardson_LAR')
DROP DATABASE Richardson_LAR
/*Create a database named "Richardson_LAR"*/
GO
CREATE DATABASE Richardson_LAR
ON PRIMARY
(
NAME = 'Richardson_LAR',
FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\Richardson_LAR.mdf',
SIZE = 10MB,
MAXSIZE = 50MB,
FILEGROWTH = 10%
)
LOG ON
(
NAME = 'Richardson_LAR_Log',
FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\Richardson_LAR.ldf',
SIZE = 1000KB,
MAXSIZE = 5MB,
FILEGROWTH = 500KB
)
/*Create tables named Appointment, CreditCard, Customer, Employee, Payment, Receipt, Spa, SpaPackage, SpaService, and Zip.*/
GO
USE Richardson_LAR
CREATE TABLE SpaService
(
SpaServiceID smallint NOT NULL IDENTITY(1, 1),
SpaServiceName varchar(30) NOT NULL,
SpaServiceCategory char(1) NOT NULL,
SpaServicePrice smallmoney NOT NULL,
SpaServiceDescription varchar(200) NOT NULL
)
CREATE TABLE Zip
(
Zipcode char(10) NOT NULL,
City varchar(20) NOT NULL,
State char(2) NULL,
Country varchar(20) NOT NULL
)
CREATE TABLE Appointment
(
AppointmentID smallint NOT NULL IDENTITY(1, 1),
CustomerID smallint NOT NULL,
EmployeeID smallint NOT NULL,
AppointmentDateTime smalldatetime NOT NULL,
AppointmentStatus char(1) NOT NULL,
AppointmentComments varchar(200) NULL
)
CREATE TABLE CreditCard
(
CreditCardID smallint NOT NULL IDENTITY(1, 1),
CustomerID smallint NOT NULL,
CCType varchar(5) NOT NULL,
CCNumber varchar(16) NOT NULL,
CCCompany varchar(40) NOT NULL,
CCCardHolder varchar(40) NOT NULL,
CCExpiration smalldatetime NOT NULL
)
CREATE TABLE Customer
(
CustomerID smallint NOT NULL IDENTITY(1000, 1),
CustomerFirstName varchar(20) NOT NULL,
CustomerLastName varchar(20) NOT NULL,
CustomerAddress1 varchar(30) NOT NULL,
CustomerAddress2 varchar(10) NULL,
Zipcode char(10) NOT NULL,
CustomerPhone varchar(20) NOT NULL,
CustomerEmail varchar(30) NULL,
CustomerComments varchar(200) NULL,
)
CREATE TABLE Employee
(
EmployeeID smallint NOT NULL IDENTITY(2000, 1),
EmployeeGender char(1) NOT NULL,
EmployeeFirstName varchar(20) NOT NULL,
EmployeeLastName varchar(20) NOT NULL,
EmployeeAddress1 varchar(30) NOT NULL,
EmployeeAddress2 varchar(10) NULL,
Zipcode char(10) NOT NULL,
EmployeePhone varchar(20) NOT NULL,
EmployeeEmail varchar(30) NULL,
SpaID smallint NOT NULL,
EmployeeTitle varchar(30) NOT NULL,
EmployeeHireDate date NOT NULL,
EmployeeStartDate date NOT NULL
)
CREATE TABLE Hotel
(
HotelID smallint NOT NULL,
HotelName varchar(30) NOT NULL,
HotelAddress varchar(30) NOT NULL,
Zipcode char(10) NOT NULL,
HotelStarRating char(1) NULL,
HotelPictureLink varchar(100) NULL,
TaxLocationID smallint NOT NULL
)
CREATE TABLE Payment
(
PaymentID smallint NOT NULL IDENTITY(3000, 1),
AppointmentID smallint NOT NULL,
PaymentDate date NOT NULL,
PaymentAmount smallmoney NOT NULL,
PaymentMethod char(1) NOT NULL,
PaymentComments varchar(200) NULL
)
CREATE TABLE Receipt
(
ReceiptID smallint NOT NULL IDENTITY(1, 1),
AppointmentID smallint NOT NULL,
SpaPackageID smallint NOT NULL,
SpaServiceID smallint NOT NULL,
ReceiptAmount smallmoney NOT NULL,
ReceiptItemQty tinyint NOT NULL,
ReceiptDate smalldatetime NOT NULL
)
CREATE TABLE Spa
(
SpaID char(5) NOT NULL,
HotelID smallint NOT NULL,
SpaWeekdayHours smalldatetime NOT NULL,
SpaWeekendHours smalldatetime NOT NULL,
SpaAddress varchar(30) NOT NULL,
Zipcode char(10) NOT NULL,
SpaPhone varchar(20) NOT NULL,
SpaEmail varchar(30) NOT NULL
)
CREATE TABLE SpaPackage
(
SpaPackageID smallint NOT NULL IDENTITY(1, 1),
SpaPackageName varchar(30) NOT NULL,
SpaServiceID smallint NOT NULL,
SpaPackagePrice smallmoney NOT NULL,
SpaPackageDescription varchar(200) NOT NULL
)
/*Alter the Appointment, CreditCard, Customer, Employee, Payment, Zipcode, Receipt, Spa, SpaPackage, and SpaService tables by adding primary keys.*/
GO
ALTER TABLE SpaService
ADD CONSTRAINT PK_SpaServiceID
PRIMARY KEY (SpaServiceID)
ALTER TABLE Zip
ADD CONSTRAINT PK_Zipcode
PRIMARY KEY (Zipcode)
ALTER TABLE Appointment
ADD CONSTRAINT PK_AppointmentID
PRIMARY KEY (AppointmentID)
ALTER TABLE CreditCard
ADD CONSTRAINT PK_CreditCardID
PRIMARY KEY (CreditCardID)
ALTER TABLE Customer
ADD CONSTRAINT PK_CustomerID
PRIMARY KEY (CustomerID)
ALTER TABLE Employee
ADD CONSTRAINT PK_EmployeeID
PRIMARY KEY (EmployeeID)
ALTER TABLE Hotel
ADD CONSTRAINT PK_HotelID
PRIMARY KEY (HotelID)
ALTER TABLE Payment
ADD CONSTRAINT PK_PaymentID
PRIMARY KEY (PaymentID)
ALTER TABLE Receipt
ADD CONSTRAINT PK_ReceiptID
PRIMARY KEY (ReceiptID)
ALTER TABLE Spa
ADD CONSTRAINT PK_SpaID
PRIMARY KEY (SpaID)
ALTER TABLE SpaPackage
ADD CONSTRAINT PK_SpaPackageID
PRIMARY KEY (SpaPackageID)
/*Alter the Appointment, CreditCard, Customer, Employee, Payment, Receipt, Spa, and SpaPackage tables by adding foreign keys.*/
GO
ALTER TABLE Appointment
ADD
CONSTRAINT FK_CustomerID1
FOREIGN KEY (CustomerID) REFERENCES Customer (CustomerID)
ON UPDATE Cascade
ON DELETE Cascade,
CONSTRAINT FK_EmployeeID
FOREIGN KEY (EmployeeID) REFERENCES Employee (EmployeeID)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE CreditCard
ADD
CONSTRAINT FK_CustomerID2
FOREIGN KEY (CustomerID) REFERENCES Customer (CustomerID)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE Customer
ADD
CONSTRAINT FK_Zipcode1
FOREIGN KEY (Zipcode) REFERENCES Zip (Zipcode)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE Employee
ADD
CONSTRAINT FK_Zipcode2
FOREIGN KEY (Zipcode) REFERENCES Zip (Zipcode)
ON UPDATE Cascade
ON DELETE Cascade,
CONSTRAINT FK_SpaID
FOREIGN KEY (SpaID) REFERENCES Spa (SpaID)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE Hotel
ADD
CONSTRAINT FK_Zipcode3
FOREIGN KEY (Zipcode) REFERENCES Zip (Zipcode)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE Payment
ADD
CONSTRAINT FK_AppointmentID1
FOREIGN KEY (AppointmentID) REFERENCES Appointment (AppointmentID)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE Receipt
ADD
CONSTRAINT FK_AppointmentID2
FOREIGN KEY (AppointmentID) REFERENCES Appointment (AppointmentID)
ON UPDATE Cascade
ON DELETE Cascade,
CONSTRAINT FK_SpaPackageID
FOREIGN KEY (SpaPackageID) REFERENCES SpaPackage (SpaPackageID)
ON UPDATE Cascade
ON DELETE Cascade,
CONSTRAINT FK_SpaServiceID1
FOREIGN KEY (SpaServiceID) REFERENCES SpaService (SpaServiceID)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE Spa
ADD
CONSTRAINT FK_HotelID
FOREIGN KEY (HotelID) REFERENCES Hotel (HotelID)
ON UPDATE Cascade
ON DELETE Cascade
ALTER TABLE SpaPackage
ADD
CONSTRAINT FK_SpaServiceID2
FOREIGN KEY (SpaServiceID) REFERENCES SpaService (SpaServiceID)
ON UPDATE Cascade
ON DELETE Cascade