title: Alter table with foreign key
body: <p>I have three tables.</p>
  
  <pre><code>Person (id, FirstName, LastName, BirthDate)
  Contact (id, contact, type)
  PersonContact( Person_id, Contact_id )
  </code></pre>
  
  <p>As you can see that Person_id is comming from Person table in PersonContact table
  And Contact_id is comming from Contact table in PersonContact table</p>
  
  <p>I want to write a query that should relate Person_id column of PersonContact table with id column of Person Table as foreign key.</p>
  
  <p>And Contact_id column of PersonContact with id column of Contact table as foreign key</p>