Laravel统计一段时间间隔的数据方法

获取七天以前到现在的数据: $days = Input::get('days', 7); $range = \Carbon\Carbon::now()->subDays($days); $stats = User::where('created_at', '>=', $range) ->groupBy('date') ->orderBy('date', 'DESC') ->get([ DB::raw('Date(created_at) as date'), DB::raw('COUNT(*) as value') ]); SELECT sum(case when `Em