Sum of current row and remaining rows

Question

Hi Experts,
I have a requirement to pull the data like below.
ename salary expected_salary
ravi 10 250
kiran 20 240
uday 30          220
joe 70 190
anil 120           120
can you please help me.
i wrote a query like below
select ename, sal, sum(sal) over (ORDER BY sal desc ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) expected_sal
          from emp;

Answer 1

Hi,
ravt261 wrote:
Hi Experts,
I have a requirement to pull the data like below.
ename salary expected_salary
ravi 10 250
kiran 20 240
uday 30          220
joe 70 190
anil 120           120
can you please help me.
i wrote a query like below
select ename, sal, sum(sal) over (ORDER BY sal desc ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) expected_sal
          from emp;What's wrong with the query you wrote?
When I run it usin the scott.emp table, I get thse results:
ENAME             SAL EXPECTED_SAL
SMITH             800        29025
JAMES             950        28225
ADAMS            1100        27275
MARTIN           1250        26175
WARD             1250        24925
MILLER           1300        23675
TURNER           1500        22375
ALLEN            1600        20875
CLARK            2450        19275
BLAKE            2850        16825
JONES            2975        13975
SCOTT            3000        11000
FORD             3000         8000
KING             5000         5000Post the reults you want.
Point out where the results above are wrong, and explain how you get the right results in those places.
***** The part below isn;t quite right. See {message:id=10946897} *****
You don't need the windowing clause (that is, ROWS BETWEEN ...):
SELECT    ename
,        sal
,        SUM (sal) OVER ( ORDER BY  sal DESC
                            -- ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
                )            AS expected_sal
from      scott.emp
ORDER BY  sal
;will get the same results. If you like the windowing clause (e.g., if you think it makes the code clearer) then keep on using it; it won't change the results whether you use it or not.
Edited by: Frank Kulash on Apr 4, 2013 9:31 AM
Edited by: Frank Kulash on Apr 4, 2013 11:00 AM