SUM - amount of product in all WAREHOUSEs

Question

Hi
I am sql beginner and have a problem with collecting data from Oracle DB.
I have a table ODT with all the products (nr of product and nr of warehouse are the PK) (NTWR and NODD).
for every warehouse the product has its row.
for example product nr 658:
NAME NTWR NODD AMOUNT
EXAMPLEPRODUCT658 658 1 30
EXAMPLEPRODUCT658 658 2 207
EXAMPLEPRODUCT658 658 3 1602
I'd like to learn how to sum the amount for NODD.
Example output
NAME NTWR AMOUNT
EXAMPLEPRODUCT658 658 237 //the amount for NODD 1&2
EXAMPLEPRODUCT768 768 568 //the amount for NODD 1&2
I made a query like this to sum amount for a product by entered number:
SELECT SUM(SUMAMO) FROM (SELECT ODT.AMOUNT SUMAMO, ODT.NTWR, ODT.NAME FROM ODT WHERE ODT.NTWR = '657' AND ODT.NODD IN (1,2))
and it works for one product
great! :) but i entered this query into larger one with product number and name:
SELECT * FROM
SELECT DISTINCT a.NTWR,
(SELECT SUM(SUMAMO) FROM (SELECT ODT.AMOUNT SUMAMO, ODT.NTWR, ODT.NAME FROM ODT WHERE ODT.NTWR = a.NTWR AND ODT.NODD IN (1,2))),
a.NAME
FROM ODT a)
and i have an error for a.NTWR in SUM -> bad identifier
What can i do to count sum for every product?
1. Sorry for my English
2. I would appreciate any help

Answer 1

Can you send me the exact query that you are using?
But make sure that in group by clause, you are using the same arguments, as there are present in your select statement
for eg
incorrect one
select a,b from tem
where a=1
and b=2
group by b;
Correctone
select a,b from tem
where a=1
and b=2
group by a,b;