title: Primary & Foreign Keys in pgAdmin
body: <p>I was wondering can some give me an explanation on how to assign primary and foreign keys in pgAdmin?</p>
  
  <p>I can't find any information online.</p>
  
  <p>For example...I've got a Student table with all their details (address, d.o.b. and etc.). I'm going to add a student_number to the table and make it a primary key.</p>
  
  <p>I just want to know how do I do that using pgAdmin? And if you may be kind to explain give me further information on using Primary Keys in postgreSQL (and pgAdmin). The same case with the  foreign keys.</p>