The aggregate expression cannot be used in the WHERE clause - sql

Question

I have the following tables in my database:
The first table is named Amount, second Product, third Purchase.
And I should to create the trigger on insert to amount table. For example, I'll insert the following values: 4, 1, 10, where 4 is id_purchase, 1 is id_product and 4 is amount of this products. And trigger should subtract this amount from Amount_On_Stock. In my example, it should be: was 48, became 38.
Here's the code of my trigger:
CREATE TRIGGER AmountInsert ON Amount
AFTER INSERT
AS
BEGIN
UPDATE Product
SET Amount_On_Stock = (
SELECT
Amount_On_Stock
FROM Product
WHERE ID_Product = (
SELECT
MAX(ID_Product)
FROM Purchase
WHERE ID_Purchase = (
SELECT
MAX(ID_Purchase)
FROM Purchase
)
)
)-(
SELECT
Amount
FROM AMOUNT
WHERE ID_Product = (
SELECT
MAX(ID_Product)
FROM Purchase
WHERE ID_Purchase = (
SELECT
MAX(ID_Purchase)
FROM Purchase
)
)
)
END
But when I try to create this trigger I have the following error:
The aggregate expression cannot be used in the WHERE clause unless it
is contained in a subquery of the HAVING clause or in the select list,
and the column being aggregated is not an external reference.
So, how can I solve this problem?

Answer 1

Your trigger looks nothing like a SQL Server trigger. I would expect your trigger to look more like this:
CREATE TRIGGER AmountInsert ON Amount AFTER INSERT
AS
BEGIN
UPDATE p
SET Amount_On_Stock = p.Amount_On_Stock - i.amount
FROM Product p JOIN
inserted i
ON p.ID_Product = i.ID_Product;
END;
However, this will not do the right thing if you have multiple inserts on the same product at the same time. To handle that you need aggregation:
CREATE TRIGGER AmountInsert ON Amount AFTER INSERT
AS
BEGIN
UPDATE p
SET Amount_On_Stock = p.Amount_On_Stock - i.amount
FROM Product p JOIN
(SELECT i.ID_Product, SUM(i.amount) as amount
FROM inserted i
GROUP BY i.ID_Product
) i
ON p.ID_Product = i.ID_Product;
END;