sql The multi-part identifier could not be bound sql server - mysql

Question

I have that error with execute "The multi-part identifier "od.Ordernumber" could not be bounds"
"The multi-part identifier "od.Location_code" could not be bounds"
create function Mbse.udf_ordertotal
(#Numberoforder int , #loction_code int )
returns int
as
begin
declare #amount as int
set #amount=(select sum(od.amount) from Mbse.OrderDetails as od
where (#Numberoforder=od.Ordernumber and #loction_code=od.Location_code)
)
return #amount
end
alter table Mbse.orders
add amount as Mbse.udf_ordertotal(Mbse.OrderDetails.Ordernumber , Mbse.OrderDetails.location_code)
i expect solve for this problem please

Answer 1

Like Jeff said in the comments, your computed column using a user-defined function to aggregate the Mbse.OrderDetails table is not a good idea for multiple reasons. It'll be heavy, will process RBAR (row by agonizing row) aka once per every row, and will prevent parallelism for any queries that reference that function or your Mbse.orders table directly or even indirectly.
You'd be better off with proper indexing on your OrderDetails table and a view that joins it to your Orders table like so:
-- Columnstore indexes are typically very quick for aggregative queries
CREATE NONCLUSTERED COLUMNSTORE INDEX IX_OrderDetails_Amount ON Mbse.OrderDetails (Ordernumber, Location_code, amount);
CREATE VIEW Mbse.OrdersWithTotals
AS
WITH _OrderDetailsTotals AS
(
SELECT
Ordernumber,
Location_code,
SUM(amount) AS TotalAmount
FROM Msbe.OrderDetails
GROUP BY
Ordernumber,
Location_code
)
SELECT
O.Ordernumber,
O.location_code,
ODT.TotalAmount
FROM Mbse.orders AS O
LEFT JOIN _OrderDetailsTotals AS ODT
ON O.Ordernumber = ODT.Ordernumber
AND O.location_code = ODT.Location_code;