我怎样才能得到我减去的 2 行的总数？

Question

public function vparticulardiscountamount($id)
{
    $fetch = DB::table('tbl_payment_user_map')
        ->leftJoin('tbl_payment_particular', 'tbl_payment_user_map.payment_particular', '=', 
          'tbl_payment_particular.id')
        ->leftJoin('tbl_discount', 'tbl_payment_user_map.discount', '=', 'tbl_discount.id')
        ->select('tbl_payment_particular.amount','tbl_discount.amount as 
         discountamount',DB::raw('(tbl_payment_particular.amount - tbl_discount.amount) as 
          total'))
        ->where('tbl_payment_user_map.payment_user',$id)
        ->get();

        return response()->json(['results' => $fetch], 200);
}

Answer 1

您可以使用 Collection 的 sum 方法并将结果添加到您的响应中。

return response()
    ->json(['results' => $fetch, 'sum' => $fetch->sum('total')], 200);

或

return response()
    ->json(['results' => ['data' => $fetch, 'sum' => $fetch->sum('total')]], 200);

我怎样才能得到我减去的 2 行的总数？

How can i get the total of the 2 rows that i subtract?

alias

laravel