eloquent id where clause laravel code example

Example 1: laravel update from query

$affected = DB::table('users')
              ->where('id', 1)
              ->update(['votes' => 1]);

Example 2: how to use join in laravel 5.4

DB::table('users')
            ->join('contacts', 'users.id', '=', 'contacts.user_id')
            ->join('orders', 'users.id', '=', 'orders.user_id')
            ->select('users.id', 'contacts.phone', 'orders.price')
            ->get();