Laravel原始查询

Question

我在mysql中测试了以下查询：

select a.name,l.name,al.count from artikel as a inner join 
artikel_location as al on a.id=al.artikel_id inner join location
as l on l.id=al.location_id

输出是我所期望的。但是当我在这样的laravel中运行时：

$products = DB::select( DB::raw("select a.name,l.name,al.count from artikel as a inner join 
                                        artikel_location as al on a.id=al.artikel_id inner join location
                                        as l on l.id=al.location_id") );
dd(json_encode($products));

a.name字段消失了？那是为什么？