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

DB::table("users")->select('*')->whereNotIn('user_name',function($query) {

   $query->select('user_name')->from('buy_courses');

})->get();

just join actually is inner join in Laravel so actually maybe also you can try:

DB::table('users')
            ->join('buy_courses', 'users.user_name', '=', 'buy_courses.user_name')
            ->get();