Hive: Sum over a specified group (HiveQL)

Question

I have a table:

key    product_code    cost
1      UK              20
1      US              10
1      EU              5
2      UK              3
2      EU               


        

Answer 1

This query gives me perfect result

select key, product_code, cost, sum(cost) over (partition by key) as total_costs from zone;