Select rows from the table which don't exist in another table

Hi, in this relatively simple task I have some problem. I need to get the records from the T1 which don't exist in T2, based on some criteria.
here is my query:
select a.ordernum, sum(totchg), b.tracknum, rownum from T1 a, T2 b where 1=1 and a.ordernum not in( select ordernum from T2 ) and entrydate between to_date('06/23/2007','MM/dd/yyyy') and to_date('06/30/2007','MM/dd/yyyy') group by a.ordernum, b.tracknum, rownum
it suppose to return me "TRACKNUM" empty, however it's being returned populated.
I also tried :
select a.ordernum, sum(totchg),b.tracknum, rownum from T1 a,
T2 b where[b] not exists( select '1' from T2 where a.ordernum = b.ordernum )
and entrydate between to_date('06/23/2007','MM/dd/yyyy') and to_date('06/30/2007','MM/dd/yyyy') group by a.ordernum, b.tracknum, rownum
the results are the same.
please advise.

You are trying to get a returned value field from T2 when you just said that the
records returned from Only T1 are not found in T2, therefore no T2 record to return.
You only get T1 records where the Ordernum key is not found in T2.
select ordernum, tracknum, rownum, sum(totchg)
from T1
where ordernum not in( select ordernum from T2 )
and (entrydate between to_date('06/23/2007','MM/dd/yyyy') and
to_date('06/30/2007','MM/dd/yyyy') )
group by ordernum, tracknum, rownum

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