hyperf框架聚合查询多字段查询

hyperf框架聚合查询（count, max, min, avg, sum）基础使用方法是单个查询的

$count = Db::table('user')->count('id');
$count = Db::table('user')->sum('number');

需要查询多个字段，如sql语句：

select sum(number),sum(number1),sum(number2),sum(number3) from user

hyperf框架内使用 first() 实现同时使用聚合查询多个字段

$count = DB::table('user')->where('p_id', '=', 1)
                        ->first(array(
                            DB::raw('SUM(number) as number'),
                            DB::raw('SUM(number1) as number1'),
                            DB::raw('SUM(number2) as number2'),
                            DB::raw('COUNT(id) as count'),
                        ));

 结果如下，返回一个数组

$count =["number"=>"3595.0000",
        "number1"=>"12187.0500",
        "number2"=>"12187.0500",
        "count"=>841]