Help need in sql

Question

i have a scenario like
bank_division sum(amount) total_percentage(calculated by : / total sum of adjacent amounts i.e(10000+2000+3000+4000) *100
aaaa 10000
bbb 2000
ccc 3000
dddd 40000
for above thing i have written sql like
select bank_division,sum(amount)  from bank group by bank;
but i am unable to calculate percentage for each bank_division..........
.its like for aaaa correspoding percentage will be
10000/ total sum of adjacent amounts i.e(10000+2000+3000+4000) *100
and for bbb it will be
2000/ total sum of adjacent amounts i.e(10000+2000+3000+4000) *100
so on...
can any one help me how to write in single sql

Answer 1

user632733 wrote:
in your sql you are using lag to display from existing total_sal....which cant be possible in above scenario..??? Where did you see existing total_sal? EMP table:
SQL> select deptno,ename,sal from emp
  2  /
    DEPTNO ENAME             SAL
        20 SMITH             800
        30 ALLEN            1600
        30 WARD             1250
        20 JONES            2975
        30 MARTIN           1250
        30 BLAKE            2850
        10 CLARK            2450
        20 SCOTT            3000
        10 KING             5000
        30 TURNER           1500
        20 ADAMS            1100
    DEPTNO ENAME             SAL
        30 JAMES             950
        20 FORD             3000
        10 MILLER           1300
14 rows selected.
SQL> As you can see, there are multiple employees in each department. Now look at mu solution. Inner select:
         select  deptno,
                 sum(sal) total_sal
           from  emp
           group by deptnosummarizes sal for each department. If you run it separately:
SQL>          select  deptno,
  2                   sum(sal) total_sal
  3             from  emp
  4             group by deptno
  5  /
    DEPTNO  TOTAL_SAL
        30       9400
        20      10875
        10       8750
SQL> Outer select calculates previous department total salary and its ratio to report.
SY.
P.S. And if you want to display individual employees along with department level summarization:
select  deptno,
        ename,
        total_sal,
        prev_deptno,
        last_value(total_sal) over(order by deptno range between unbounded preceding and 1 preceding) prev_dept_total_sal,
        ratio_to_report(total_sal) over () * 100
  from  (
         select  deptno,
                 ename,
                 sum(sal) over(partition by deptno) total_sal,
                 max(deptno) over(order by deptno range between unbounded preceding and 1 preceding) prev_deptno
           from  emp
  order by deptno
    DEPTNO ENAME       TOTAL_SAL PREV_DEPTNO PREV_DEPT_TOTAL_SAL RATIO_TO_REPORT(TOTAL_SAL)OVER()*100
        10 MILLER           8750                                                           6.38569604
        10 KING             8750                                                           6.38569604
        10 CLARK            8750                                                           6.38569604
        20 ADAMS           10875          10                8750                           7.93650794
        20 FORD            10875          10                8750                           7.93650794
        20 JONES           10875          10                8750                           7.93650794
        20 SMITH           10875          10                8750                           7.93650794
        20 SCOTT           10875          10                8750                           7.93650794
        30 WARD             9400          20               10875                           6.86006203
        30 TURNER           9400          20               10875                           6.86006203
        30 ALLEN            9400          20               10875                           6.86006203
    DEPTNO ENAME       TOTAL_SAL PREV_DEPTNO PREV_DEPT_TOTAL_SAL RATIO_TO_REPORT(TOTAL_SAL)OVER()*100
        30 JAMES            9400          20               10875                           6.86006203
        30 BLAKE            9400          20               10875                           6.86006203
        30 MARTIN           9400          20               10875                           6.86006203
14 rows selected.
SQL>