what does groupby do in laravel code example

Example 1: group by laravel

$user_info = DB::table('usermetas')
                 ->select('browser', DB::raw('count(*) as total'))
                 ->groupBy('browser')
                 ->get();

Example 2: groupby in laravel

You can use unique('field_name'); instead of groupBy('field_name');
/**
 * Show the application dashboard.
 *
 * @return \Illuminate\Http\Response
 */
public function index()
{
    $messages = Message::select("*")
                            ->where('receiver_id',$id)
                            ->orderBy('created_at', 'desc')
                            ->get()
                            ->unique('sender_id');
  
    dd($messages);
}