This article will be useful for beginners of T-SQL to create Primary Key and Foreign Key in SQL Server 2008.
Introduction
Hi everyone! This article shows how to use primary key
and foreign key in SQL Server.
Objective
Create and use primary key and foreign key in SQL Server.
Using
the code
--create tables with Primary and foreign key
create table Tbl_Country(cnid int primary key,cnname varchar(max))
create table Tbl_State(stid int primary key,cnid int foreign key references
Tbl_Country,stname varchar(max))
create table Tbl_City(ctid int primary key,stid int foreign key references
Tbl_State,ctname varchar(max))
--select all table.
select * from Tbl_Country
select * from Tbl_State
select * from Tbl_City
--INSERT DATA TO COUNTRIES
insert into Tbl_Country(cnid,cnname) values(101,'INDIA')
insert into Tbl_Country(cnid,cnname) values(102,'AMERICA')
insert into Tbl_Country(cnid,cnname) values(103,'PAKISTAN')
--INSERT DATA TO STATES OF INDIA
insert into Tbl_State(stid,cnid,stname)values(201,101,'TAMILNADU')
insert into Tbl_State(stid,cnid,stname)values(202,101,'MAHARASTRA')
insert into Tbl_State(stid,cnid,stname)values(203,101,'AP')
insert into Tbl_State(stid,cnid,stname)values(204,101,'KERALA')
insert into Tbl_State(stid,cnid,stname)values(205,101,'PUNJAB')
--INSERT DATA TO STATES OF AMERICA
insert into Tbl_State(stid,cnid,stname)values(207,102,'WASHINGTON')
insert into Tbl_State(stid,cnid,stname)values(208,102,'NEWYORK')
--INSERT DATA TO STATES OF PAKISTAN
insert into Tbl_State(stid,cnid,stname)values(209,103,'ISLAMABAD')
--INSERT DATA TO CITY OF TAMILNADU
insert into Tbl_City(ctid,stid,ctname)values(301,201,'KUMBAKONAM')
insert into Tbl_City(ctid,stid,ctname)values(302,201,'TRICHY')
insert into Tbl_City(ctid,stid,ctname)values(303,201,'THANJOR')
insert into Tbl_City(ctid,stid,ctname)values(304,201,'CHENNAI')
insert into Tbl_City(ctid,stid,ctname)values(305,201,'MADHURAI')
insert into Tbl_City(ctid,stid,ctname)values(306,201,'KOVI')
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