How to get a summ of all previous values

Question

Hello ALL,
Could you please give an advice on how to find the sums of all previous values in 1 select without using dynamic sql. Cross join is not a variant because of a huge response time.
OR may be there are any other ideas on how to find first rows with total sum equals to some general value? My idea is to find a sum of all preceding values and the first of such sums that would be equal to the general value or greater it is a necessary result.
For example we have goods receipts:
MATERIAL | BATCH | QTY
material1 batch1 1
material1 batch2 2
material1 batch3 3
material1 batch4 4
material1 batch5 5
material1 batch6 6
and general qty is 7 - it's our current stock. So I should take material from [batch1 to batch4] to get necessary QTY >=7 (1+2+3+4=10>7) So our current stock consists of batch1,batch2,batch3 and remains of batch4.
Thanks in advance!
Edited by: user9321926 on Jun 18, 2010 3:56 AM

Answer 1

Some thing like:
  1  select
  2     empno,
  3     sal,
  4     (select sum(sal) from emp b where  b.empno <= a.empno) running_total
  5* from (select * from emp order by empno) a
SQL> /
     EMPNO        SAL RUNNING_TOTAL
      7369        800           800
      7499       1600          2400
      7521       1250          3650
      7566       2975          6625
      7654       1250          7875
      7698       2850         10725
      7782       2450         13175
      7788       3000         16175
      7839       5000         21175
      7844       1500         22675
      7876       1100         23775
     EMPNO        SAL RUNNING_TOTAL
      7900        950         24725
      7902       3000         27725
      7934       1300         29025
14 rows selected.
SQL>