如何在两个表中建立外键关系

Question

I have creating database name called montage. same database hosted server . i cant able to back up server database. so i am created locally . i have two table name called

 1.TP_Users
 2.TP_Roles

Following Table below Fields

 TP_Users 
 --------
 Id     PK, int, not null
 UserName   nvarchar(50), null
 UserEmail  nvarchar(50), null
 DisplayName nvarchar(50), null
 Password   nvarchar(50), null
 RoleId FK, int, not null        -------------->Foreign key this make Relationship in TP_Roles Id column
 IsActive   bit, not null
 ClientId   int, null

Another table TP_Roles following Fields like this

 TP_Roles 
 --------
 Id PK, int, not null
 Role_Name  varchar(200), null
 IsActive   bit, null

In server database i seen relationship table i seen Like following

FK Name                             Parent tabl name  column_id Refrenced table name    column_id
    FK__Users_cop__RoleI__27AED5D5  TP_Users    RoleId  6      TP_Roles             Id  1 
    FK__Users_cop__RoleI__28A2FA0E  TP_Users    RoleId  6      TP_Roles             Id  1

I have See like Relationship server database above like this but when i create Local database same like above how can i create local database

Answer 1

You can add a foreign key constraint using the ALTER TABLE DDL statement:

ALTER TABLE TP_Users 
ADD CONSTRAINT FK_TP_Users_TP_Roles FOREIGN KEY (RoleId)     
    REFERENCES TP_Roles  (Id )     
    ON DELETE CASCADE -- optional   
    ON UPDATE CASCADE -- optional    
;