Selecting only a sequence - db2-400

Question

I would like to select in my table only a part after i read 00006 and stop selecting when i read the next pattern 00XXX .(here it's 00040 but it's could be an another number )
00006
123456
456789
123789
00040
125478
547896
454623
519846
00001
....
Here , for example i would like to get only these values with a select :
123456
456789
123789
How is the way to obtain that ? I dont find any clue.
Thanks for your help.
ps: i have no rights for transform the table where i select
With the solution of Charles :
with marker as (
select rownumber() over() as rowno
, rrn(t) as recno, cast(substr(YYYYYY, 1, 5)as integer) as markvalue
from fap1t010.£$ZZZZZZ t
where substr(YYYYYY, 1, 5) like ('00___')
), dataa as (
select rrn(t) as recno, cast(substr(YYYYYY, 1, 6)as integer) as datavalue
from fap1t010.£$ZZZZZZ t
where substr(YYYYYY, 1, 5) NOT like ('00006')
and substr(YYYYYY, 13, 1) ='C'
), ranges as(
select a.markvalue
, a.recno as startrec
, b.recno as endrec
from marker A join marker B
on b.rowno = a.rowno +1
)
select distinct d.datavalue
from ranges R join dataa D
on d.recno between r.startrec and r.endrec
where r.markvalue = 00006

Answer 1

Wow...that's an ugly request.
But it can be done:
with marker as (
select rownumber() over() as rowno
, rrn(t) as recno, myfld as markvalue
from dtcwilt.temp t
where myfld like ('00___ ')
), data as (
select rrn(t) as recno, myfld as datavalue
from dtcwilt.temp t
where myfld NOT like ('00___ ')
), ranges as(
select a.markvalue
, a.recno as startrec
, b.recno as endrec
from marker A join marker B
on b.rowno = a.rowno +1
)
select d.datavalue
from ranges R join data D
on d.recno between r.startrec and r.endrec
where r.markvalue = '00006';
If you have a large data set, performance isn't going to be all that great; there's probably room for improvement. But the above is at least easy to understand.
If you happen to be on the latest version 7.3 of IBM i, you could probably simplify the statement by making use of the new LEAD() and/or LAG() functions. But I don't have 7.3 to test on.