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

You can use SQL's 'NOT IN'.

Example:

mysqli_query($con, "SELECT * FROM users WHERE user_name NOT IN (SELECT user_name FROM buy_courses)");

Answer 2

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();

Answer 3

Try it using Eloquent:

$courseUserNames = BuyCourses::pluck('user_name')->all();
$users = User::whereNotIn('user_name', $courseUserNames)->select(...)->get();

Or if you prefer using DB query:

$courseUserNames = DB::table('buy_courses')->pluck('user_name')->all();
$users = DB::table('users')->whereNotIn('user_name', $courseUserNames)->select(...)->get();

Answer 4

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();