text: --© Michał Martusewicz
  INSERT INTO con_user(login,password,role) VALUES
              ('adam','student','U' ),
              ('bartek','123','U' ),
              ('kazik','321','U' );
  
  select * from con_user;
  
  INSERT INTO friend_request(login1,login2) VALUES
              ('bartek', 'adam'),
              ('kazik', 'adam');
  
  
  select * from friend_request;
  select * from friends;
  
  INSERT INTO friend_request(login1,login2) VALUES
              ('adam', 'bartek');
  
  select * from friend_request;
  select * from friends;
  