我有一个名为projectlist的表，如下所示。我想获取每个国家/地区的城市列表以及每个城市的项目列表
-Country City Project -India Chennai Project1 India Hyderabad Project2 India Delhi Project3 India Mumbai Project4 India Bangalore Project5 USA Shreveport Project6 USA Chicago Project7 USA New York Project8 USA Huston Project9 Germany Berlin Project10 Germany Munich Project11 Germany Framkfurt Project12 India Hyderabad Project13 India Bangalore Project14 USA Shreveport Project15 Germany Berlin Project16 Germany Munich Project17
我的laravel控制器中包含以下代码。我知道以下代码是错误的方法，请通过示例代码指导我。 我想返回此值并在刀片视图中显示
$data4 = DB::table('loksabha2014')
->select(
DB::raw('alliance as alliance','partyname as partyname'),
DB::raw('count(*) as number'))
->groupBy('alliance')
->get();
我想在刀片视图中显示如下
城市列表：
India - Chennai, Hyderabad, Delhi, Mumbai, Bangalore
USA - Shreveport, Chicago, New York, Huston
Germany - Berlin, Munich, Framkfurt
项目列表：
Chennai - Project1
Hyderabad - Project2, Project13
Delhi - Project3
Bangalore - Project14
Shreveport - Project6, Project15
Chicago - Project7
New York - Project8
Huston - Project9
Berlin - Project10, Project16
Munich - Project11, Project17