Laravel SQL groupBy 和 Sum

Question

這是我的表關系：

**reservations** id, date, etc...<br>
**reservation_service_info** service_info_id, reservation_id<br>
**services_info** price etc...

我正在嘗試按天計算預訂價格。 下面是代碼和結果：

return $query->selectRaw('DATE(start_time) AS date')
        ->selectRaw("(SELECT SUM(price) FROM `services_info` inner join `reservation_service_info` on `services_info`.`id` = `reservation_service_info`.`service_info_id` where `reservation_service_info`.`reservation_id` = reservations.id) as price")
        ->orderBy('date', 'ASC')
        ->get('price', 'date')

結果：

[
  {
    "date": "2016-06-01",
    "price": "345.00"
  },
  {
    "date": "2016-06-01",
    "price": "90.00"
  },
  {
    "date": "2016-06-01",
    "price": "222.00"
  },
  {
    "date": "2016-06-02",
    "price": "393.00"
  },
  {
    "date": "2016-06-02",
    "price": "142.00"
  }
]

當我在查詢中添加groupBy('date') ，它按 dosent SUM(price) 對其進行分組

[
  {
    "date": "2016-06-01",
    "price": "345.00"
  },
  {
    "date": "2016-06-02",
    "price": "393.00"
  }
]

Answer 1

我認為您的查詢構建方式有點錯誤。 我會建議這樣的思考方式：

return $query->select(\DB::raw('DATE(start_time) AS date'), \DB::raw('SUM(price) as price'))
        ->join('reservation_service_info', 'reservations.id', '=', 'reservation_service_info.reservation_id')
        ->join('services_info', 'services_info.id', '=', 'reservation_service_info.services_info_id')
        ->orderBy('date', 'ASC')
        ->groupBy('date')
        ->get();

如果$query表是reservations這應該有效。

Answer 2

嘗試這個 ：

                 $users=   DB::table('reservation_service_info')
                     ->join('services_info', 'reservation_service_info.service_info_id', '=', 'services_info.id')
                     ->join('reservations', 'reservation_service_info.reservation_id', '=', 'reservations.id')
                     ->select('DATE(reservations.start_time) AS date','SUM(services_info.price) AS price')
                     ->orderBy('reservations.start_time', 'ASC')
                     ->groupBy('reservations.start_time')
                     ->get();

Answer 3

您應該使用sum(price)來獲得總和：

return $query->selectRaw('DATE(start_time) AS date')
        ->selectRaw("(SELECT SUM(price) FROM `services_info` inner join `reservation_service_info` on `services_info`.`id` = `reservation_service_info`.`service_info_id` where `reservation_service_info`.`reservation_id` = reservations.id) as price")
        ->orderBy('date', 'ASC')
        ->groupBy('date')
        ->get();