在Laravel中使用groupBy()分组并求和 项目需求:统计用户所停留页面的时长public function tongji() { $data = DB::table('tongji') ->select('page', DB::raw('SUM(staytime) as staytime')) ->groupBy('page') ->get(); return $data; }注意一定要引入 use Illuminate\Support\Facades\DB; 否则会报错