title: How can we make foreign key among tables after inserting data in those tables?
body: <p>I have created tables in <strong>sql server</strong>. And i have also inserted data/rows in that tables.</p>
  
  <p>Now i want to make relationship among them means i want to create <strong>foreign key constraints</strong> among them, is it possible ?</p>
  
  <p>Whenever i try to create relationship among table a problem is occured. "Saving changes is permitted, The changes you made required table to re-created and dropped"</p>
  
  <p>Please suggest me what should i do to make relationship(foreign key) among them ?</p>
  
  <p>My Child table design is this</p>
  
  <p><img src="https://i.stack.imgur.com/UmOxc.png" alt="this is my child table"></p>
  
  <p>this is my parent table:-
  <img src="https://i.stack.imgur.com/kQINJ.png" alt="this is my parent table"></p>
  
  <p>please now right what alter query i should write..?</p>