SQL Server Express 2012外键不会填充到表

Question

我在我的智慧结束在这里，所以任何帮助，将不胜感激。这里有三个查询我运行：

CREATE TABLE Contact 
(ContactID VARCHAR(10) NOT NULL, 
ContactCompanyName VARCHAR(80), 
ContactFirstName VARCHAR(30), 
ContactLastName VARCHAR(30), 
EmployeeID VARCHAR(15), 
CONSTRAINT Contact_PK PRIMARY KEY (ContactID)); 

GO 

CREATE TABLE CompanyRepresentative 
(EmployeeID VARCHAR(15) NOT NULL, 
RepFirstName VARCHAR(30), 
RepLastName VARCHAR(30), 
CONSTRAINT CompanyRepresentative_PK PRIMARY KEY (EmployeeID)); 

GO 

其次：

ALTER TABLE Contact 
ADD CONSTRAINT fk_EmployeeID1 
FOREIGN KEY(EmployeeID)REFERENCES CompanyRepresentative(EmployeeID); 

GO 

最后：

INSERT dbo.Contact (ContactID, ContactCompanyName, ContactFirstName,  

ContactLastName) 
VALUES 
('PC7432', 'Krueger Bakeries', 'Brian', 'Jones'), 
('PC5317', 'Advanced Data Storage', 'Mark', 'Pulley'), 
('PC2931', 'M&D Graphics and Design', 'Mike', 'Dorris'), 
('PC1753', 'Apex Digital Solutions', 'Janice', 'Becker'), 
('PC8527', 'Infensus Consultants', 'Narbeth', 'Pokrehl'); 

GO 

INSERT dbo.CompanyRepresentative (EmployeeID, RepFirstName, RepLastName) 
VALUES 
('TBOC53297', 'Mike', 'Hartman'), 
('TBOC32781', 'Lynn', 'Kynes'), 
('TBOC12783', 'Jason', 'McCann'), 
('TBOC43971', 'Susan', 'Mueller'), 
('TBOC29753', 'Greg', 'Krebs'); 

GO 

当我运行

select * from Contact 

雇员ID字段不不显示外部值关键EmployeeID从表dbo.CompanyRepresentative而不是它显示“NULL”。我错过了什么？

Answer 1

您必须插入EmployeeID这样。否则默认SQL Server将NULL插入到该字段中。

INSERT dbo.Contact (ContactID, ContactCompanyName, ContactFirstName, ContactLastName, EmployeeID) 
VALUES 
('PC7432', 'Krueger Bakeries', 'Brian', 'Jones', 'TBOC53297'), 
('PC5317', 'Advanced Data Storage', 'Mark', 'Pulley','TBOC32781'), 
('PC2931', 'M&D Graphics and Design', 'Mike', 'Dorris','TBOC12783'), 
('PC1753', 'Apex Digital Solutions', 'Janice', 'Becker','TBOC43971'), 
('PC8527', 'Infensus Consultants', 'Narbeth', 'Pokrehl','TBOC29753'); 

GO