Question

我试图从另一张表中插入一笔价格。

INSERT INTO Invoice_Of_Supplier (OrderSupplierID, PaymentStatus, Cost)
VALUES (
( SELECT OrderSupplierID FROM inserted),
0,
(SELECT SUM([Price(RUB)]) FROM Car
  JOIN OrderOfSupplier_Car AS osc ON osc.CarID=Car.CarID 
where osc.OrderSupplierID = (select OrderSupplierID from inserted)))

我有Car表格，其中包含字段price，CarID等;

带有字段Order_Of_Supplier，OrderSupplierID的

SupplierID表格;

Order_Of_Supplier_Car表，其中每个订单都有多个汽车（字段为CarID，OrderSupplierID）

我需要在表'InvoiceOfSupplier'中插入一行，其中包含'OrderSupplierID'，PaymentStatus和Cost字段。

OrderSupplierID和PaymentStatus没问题，但Cost是NULL，我无法理解原因。当我更改osc.OrderSupplierID = 2（直接获得OrderSupplierID）时，它不起作用。它只有在我删除所有条件（如'WHERE'）时才有效，但在这种情况下，它会获得所有订单的“价格（RUB）”，而不是我需要的那个。

编辑： 问题是，在Order_Of_Supplier中插入数据时，Order_Of_Supplier_Car中没有数据。

Answer 1

尝试这样的事情：

INSERT INTO Invoice_Of_Supplier (OrderSupplierID, PaymentStatus, Cost)
VALUES (
( SELECT OrderSupplierID FROM inserted),
0,
(SELECT SUM(column_name) FROM Car
where Car.CarID = OrderOfSupplier_Car.CarID
and OrderOfSupplier_Car.OrderSupplierID in (select OrderSupplierID from inserted))

Answer 2

为什么不从插入中选择？

INSERT INTO dbo.Invoice_Of_Supplier (OrderSupplierID, PaymentStatus, Cost)
SELECT
  i.OrderSupplierID,
  0,
  SUM(osc.[Price(RUB)])
FROM inserted i
inner join dbo.OrderOfSupplier_Car osc 
on osc.OrderSupplierID = i.OrderSupplierID
inner join dbo.Car c
ON c.CarID = osc.CarID 
group by i.OrderSupplierID

我认为你根本不需要加入Car

有些问题：这是after还是instead of触发？它在哪张桌子上？

在INSERT触发器SQL中使用WHERE子句

2 个答案: