EDIT:nu burde være rettet med 3-niveau select:
select * from (
select q1.*, rownum as rn from ( --get correct rownum
select * from tbl order by column --get correct order
) q1
) q2
where q2.rn between 1 and 4; -- filter
for første del.
For anden og tredje del:
where q2.rn between 5 and 8
where q2.rn between 9 and 12