Selam
bu şekilde çözdüm:
$cities = DB::table('cities')
->selectRaw('cities.name as name, cities.id as id, sum(drops) as drops, count(*) as people_count')
->join('user_infos', 'cities.id', '=', 'user_infos.city_id')
->groupBy('user_infos.city_id')
->orderByDesc('user_infos.drops')
->get();