select sum(rat), dat 
from 
  ( select distinct (s.dateexec) dat, 1 rat, summ
    from 
    ( select sum(coddoc) summ, one.dateexec dat
      from stkdocs one
      where one.coddoc < 120000
      group by one.dateexec 
      order by one.dateexec) two,
    stkdocs s
    where two.dat <= s.dateexec
          and s.coddoc < 120000) thr
group by thr.dat
order by thr.dat

------------------
1	17.10.2001
2	24.10.2001
3	29.10.2001
4	30.10.2001
5	31.10.2001
6	01.11.2001
7	02.11.2001
8	05.11.2001
9	06.11.2001
10	08.11.2001
11	10.11.2001
12	15.11.2001
13	20.11.2001