laravel关系查询两次？

Question

//Eloquent relationship 
$customer = App\Customer::find($id); //1s query
return $orders = $customer->orders(); //2nd query

class 
public function orders() {
     return $this->hasMany('App\Order', 'customer_id')->get();
}

//Query builder, only query once
$data = DB::table('customers')
      ->select('orders.name...')
      ->leftJoin('orders', 'customers.id', '=', 'orders.customer_id')
      ->get();

I'm currently learning laravel, I was wondering when I use relationship to do left join query, is it will query twice?

If so which is better for performance? query builder left join can save one query which is the one I usually go with

Answer 1

Query builder is better for performance.

https://blog.sriraman.in/laravel-eloquent-vs-fluent-query-builder/