Query rownum between help

Question

I am running this query which doesnt work. no rows returned.
select rownum,doc_file_name,doc_id,doc_status,proj_title from(
select rownum,dm.doc_file_name,dm.doc_id,dm.doc_status,pm.proj_title from document_master dm,
(select proj_id,proj_title from project_master)pm
where dm.proj_id IN
(select proj_id
from project_master where upper(proj_title) LIKE '%SUPPLIER%')
and pm.proj_id=dm.proj_id
where rownum between 50000 and 100000
when i switch it to between 1-100000 works fine. I understand rownum has to increment from 1. But I am not sure how to get this to work. have about million rows have to export in chunks, like 50k - 100k, then 100k-150k, etc..
can someone help ?

Answer 1

ROWNUM is execution plan dependent (unless ORDER BY IS USED), so your query might return differnt set of rows next time you run it even if data did not change:
select  rn,
        doc_file_name,
        doc_id,
        doc_status,
        proj_title
  from  (
         select rownum rn,
                dm.doc_file_name,
                dm.doc_id,
                dm.doc_status,
                pm.proj_title
          from  document_master dm,
                 select proj_id,
                        proj_title
                  from  project_master
                ) pm
  where dm.proj_id IN (
                       select  proj_id
                         from  project_master
                         where upper(proj_title) LIKE '%SUPPLIER%'
    and pm.proj_id=dm.proj_id
  where rn between 50000 and 100000
/SY.