laravel query builder join

1use Illuminate\Support\Facades\DB;
2
3$users = DB::table('users')
4            ->join('contacts', 'users.id', '=', 'contacts.user_id')
5            ->join('orders', 'users.id', '=', 'orders.user_id')
6            ->select('users.*', 'contacts.phone', 'orders.price')
7            ->get();

1$users = DB::table('users')
2                    ->whereIn('id', [1, 2, 3])
3                    ->get();

1 $customer = DB::table('customers')
2                ->join('shops', 'customers.shop_id', '=', 'shops.shop_id')
3                ->where('customer_contact', $contact_no)
4                ->get();

1
2->leftJoin('table3 AS c', function($join){
3        $join->on('a.field2', '=', 'c.field2')
4        ->where('a.field2', '=', true)
5        ->where('a.field3', '=', 'c.field3');
6})

1DB::select('SELECT * FROM users WHERE name = ?', array(Input::get('name')));
2

1$users = DB::table('users')
2                ->groupBy('account_id')
3                ->having('account_id', '>', 100)
4                ->get();