Question

我有两张桌子：

1-shipment_order_product(orderid,productid,quantity)
2-stock_product(productid,quantity)

在shipment_order_product表中，有一个productid对一个orderid，这意味着我会在一个订单中购买多个产品。

我想针对特定订单更新每次stock_product次购买的productid数量。

这是我的问题：

update product 
SET NoOfItems= (select sum(b.Quantity) 
from product as a,shippment_order_product as b
where a.Product_ID=b.Product_ID
group by a.Product_ID,b.Product_ID)

这给出了错误：

Msg 512, Level 16, State 1, Line 1
Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.

任何解决方案？

Answer 1

这是mssql - 你标记为多个

update p  
SET p.NoOfItems = sum(s.Quantity) 
from product as p 
join shippment_order_product as s
on p.Product_ID = s.Product_ID
group by p.Product_ID

子查询在update set子句

1 个答案: