select all columns which are not in another table laravel 5.5

Question

I have two tables - the first one is called \'users\' and the second one is called \'buy_courses\'.

I am trying to select all users those user_name

Answer 1

just replace = with != , use function join

$users = DB::table('users')
  ->join(
    'buy_courses', 
    function ($join)
    {$join->on('users.user_name', '!=', 'buy_courses.user_name');}
  )
  ->get();