Laravel 按月从 created_at 列分组和总行乘以价格不起作用

Question

我需要从 2 个要按月获取成本组的表中获取数据。这两张桌子是

spare_stock_history
(spare_id, amount, created_at)

和

base_inventory
(id, unit_price)

我需要使用股票历史的 created_at 列获取每个月的 amount*unit_price 的总和。

我写了以下查询

 StockHistory::
        select("spare_stock_history.created_at")
        ->sum("spare_stock_history.amount*base_inventory.unit_price")
        ->join("base_inventory","base_inventory.id", "=","spare_stock_history.spare_id")
        ->where(["spare_stock_history.transaction_type"=>2])
        ->orderBy('created_at')
        ->groupBy(StockHistory::raw('MONTH(spare_stock_history.created_at)'))
        ->get();

但它给了我以下 sql 错误：

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'spare_stock_history.amount*base_inventory.unit_price' in 'field list' (SQL: select sum(`spare_stock_history`.`amount*base_inventory`.`unit_price`) as aggregate from `spare_stock_history`)

我该如何解决这个问题？提前致谢

Answer 1

使用DB:raw 处理查询生成器上的原始表达式。

   StockHistory::
select(["spare_stock_history.created_at", DB::raw("SUM(spare_stock_history.amount * base_inventory.unit_price)")])
    ->join("base_inventory", "base_inventory.id", "=", "spare_stock_history.spare_id")
    ->where("spare_stock_history.transaction_type",2)
    ->orderBy('created_at')
    ->groupBy(DB::raw('MONTH(spare_stock_history.created_at), SUM(spare_stock_history.amount * base_inventory.unit_price)'))
    ->get();