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

similar answer (if we use oracle emp table):

select deptno, ename, sal, sum(sal) over(partition by deptno) from emp;

output will be like below:

deptno  ename   sal sum_window_0
10  MILLER  1300    8750
10  KING    5000    8750
10  CLARK   2450    8750
20  SCOTT   3000    10875
20  FORD    3000    10875
20  ADAMS   1100    10875
20  JONES   2975    10875
20  SMITH   800     10875
30  BLAKE   2850    9400
30  MARTIN  1250    9400
30  ALLEN   1600    9400
30  WARD    1250    9400
30  TURNER  1500    9400
30  JAMES   950     9400