laravel中选择多个表列和别名条件

Question

我想在 laravel 中实现这个查询..

select sum(reading * multiplier) as consumption, reading_date, count(id) as num, (sum(reading * multiplier) / count(id)) as average 
from electricities where meter_name != '' ;

到目前为止我有这个

electricities = Electricity::select(DB::raw('sum(reading * multiplier) as consumption', 'reading_date', 'count(id) as num', '(sum(reading * multiplier) / count(id)) as average'))
                                        ->where('factory_code', '=', $request->$factory_code)
                                        ->whereYear('reading_date', $request->$year)
                                        ->groupBy(DB::raw('month(reading_date)'))
                                        ->orderBy('reading_date', 'asc')
                                        ->get();

但它不会返回所需的输出..

谁能帮我解决这个问题？谢谢

Answer 1

根据您的查询：

electricities = Electricity::select(DB::raw('sum(reading * multiplier) as consumption', 'reading_date', 'count(id) as num', '(sum(reading * multiplier) / count(id)) as average'))
                                        ->where('meter_name', '!=', '')
                                        ->get();