小编Das*_*sin的帖子

我有以下三张表 -

但是当我添加外键引用时，关系（数据库图中的直线）未显示。

以下是我写的参考资料。

ALTER TABLE [dbo].EmployeeDesignation   
ADD CONSTRAINT FK_EmployeeDesignation_Employee FOREIGN KEY (EmployeeId)     
    REFERENCES Employee (EmployeeId)     
    ON DELETE CASCADE    
    ON UPDATE CASCADE    
;

ALTER TABLE [dbo].[EmployeeDesignation]     
ADD CONSTRAINT FK_EmployeeDesignation_Designation FOREIGN KEY (DesignationId)     
    REFERENCES Designation (DesignationId)     
    ON DELETE CASCADE    
    ON UPDATE CASCADE    
;

另外，当我添加另外两个表（Department and EmployeeDepartment）时，我可以看到图中的关系

供参考的代码如下——

ALTER TABLE [dbo].EmployeeDepartment     
ADD CONSTRAINT FK_EmployeeDepartment_Department FOREIGN KEY (DepartmentId)     
    REFERENCES Department (DepartmentId)     
    ON DELETE CASCADE    
    ON UPDATE CASCADE    
;

ALTER TABLE [dbo].EmployeeDepartment     
ADD CONSTRAINT FK_EmployeeDepartment_Employee FOREIGN KEY (EmployeeId)     
    REFERENCES Employee (EmployeeId) …