Update empty row / column values

Question

here is the sample data
Col_1 -- col_2-----col_3-------col_4------col_5------col_6
9--------111---------45-----------21
7--------877
2--------456
8--------765
I am trying to update the col_3,col_4,col_5,col_6 like
Col_1 -- col_2-----col_3-------col_4------col_5------col_6
9--------111---------45-----------21--------4654------6534
7--------877---------67-----------42
2--------456---------845----------4563
8--------765
How to insert/update the col_3,Col_4,Col_5,col_6 by adding values in sequence, I want insert the values in 2nd row then 3rd row etc.
how to select next empty row of the particular column without including the other column values in where condition.
Using ROWNUM or ROWID it's possible selecting the next row of the particular column ?
Thanks in advance.

Answer 1

following query i use for something:
with
week1 as (select decap as decap_w1,desrvid as desrvid_w1 from drdiskspace where deweek = to_char(sysdate,'WW')-1),
week2 as (select decap as decap_w2,desrvid as desrvid_w2 from drdiskspace where deweek = to_char(sysdate,'WW')-2),
week3 as (select decap as decap_w3,desrvid as desrvid_w3 from drdiskspace where deweek = to_char(sysdate,'WW')-3),
week4 as (select decap as decap_w4,desrvid as desrvid_w4 from drdiskspace where deweek = to_char(sysdate,'WW')-4),
week5 as (select decap as decap_w5,desrvid as desrvid_w5 from drdiskspace where deweek = to_char(sysdate,'WW')-5),
week6 as (select decap as decap_w6,desrvid as desrvid_w6 from drdiskspace where deweek = to_char(sysdate,'WW')-6),
week7 as (select decap as decap_w7,desrvid as desrvid_w7 from drdiskspace where deweek = to_char(sysdate,'WW')-7),
week8 as (select decap as decap_w8,desrvid as desrvid_w8 from drdiskspace where deweek = to_char(sysdate,'WW')-8),
week9 as (select decap as decap_w9,desrvid as desrvid_w9 from drdiskspace where deweek = to_char(sysdate,'WW')-9),
week10 as (select decap as decap_w10,desrvid as desrvid_w10 from drdiskspace where deweek = to_char(sysdate,'WW')-10)
select desrvnaam || ' ' || desrvschijf, decap, decap_w1, decap_w2, decap_w3, decap_w4, decap_w5, decap_w6, decap_w7, decap_w8, decap_w9, decap_w10
from drdiskspace, drserver, week1, week2, week3, week4, week5, week6, week7, week8, week9, week10
where drdiskspace.deweek = to_char(sysdate,'WW')
and drdiskspace.desrvid=drserver.desrvid
and drdiskspace.desrvid=desrvid_w1
and drdiskspace.desrvid=desrvid_w2
and drdiskspace.desrvid=desrvid_w3
and drdiskspace.desrvid=desrvid_w4
and drdiskspace.desrvid=desrvid_w5
and drdiskspace.desrvid=desrvid_w6
and drdiskspace.desrvid=desrvid_w7
and drdiskspace.desrvid=desrvid_w8
and drdiskspace.desrvid=desrvid_w9
and drdiskspace.desrvid=desrvid_w10
and drdiskspace.desrvid=:P200_ZOEK;
greatz,
Jan Louis