SQL QUERY TO REMOVE ONE OF THE THE RESULT SET

Question

Hello Everyone,
I need some advise on how to achieve the subject. My query is as follows:
select t2.post_date a, trunc(sysdate - (&num + 1))
from trans_hist t2
where t2.post_date >= trunc(sysdate - (&num + 1))
and 'xxxxxxxxxxxxxxx' in
(t2.reference_from_account_id, t2.reference_to_account_id)
and decode(t2.reference_from_account_id,
'xxxxxxxxxxxxxxx',
t2.from_account_balance,
t2.to_account_balance) = 150
order by t2.post_date
It will give me the following result:
4-JUN-2007
5-JUN-2007
6-JUN-2007
I will would to build my query so that it excludes the last row. My aim is to come up with something like the below:
select max(t2.post_date)
from trans_hist t2
where t2.post_date >= trunc(sysdate - (&num + 1))
and 'xxxxxxxxxxxxxxx' in
(t2.reference_from_account_id, t2.reference_to_account_id)
and decode(t2.reference_from_account_id,
'xxxxxxxxxxxxxxx',
t2.from_account_balance,
t2.to_account_balance) = 150
order by t2.post_date
Thank you for your help.
Randy

Answer 1

maybe something like:
SQL> with trans_hist as
  2  (select to_date('4-JUN-2007','DD-MON-YYYY') post_date from dual union all
  3   select to_date('5-JUN-2007','DD-MON-YYYY') post_date from dual union all
  4   select to_date('6-JUN-2007','DD-MON-YYYY') post_date from dual)
  5  select * from trans_hist;
POST_DATE
04-JUN-07
05-JUN-07
06-JUN-07
SQL> with trans_hist as
  2  (select to_date('4-JUN-2007','DD-MON-YYYY') post_date from dual union all
  3   select to_date('5-JUN-2007','DD-MON-YYYY') post_date from dual union all
  4   select to_date('6-JUN-2007','DD-MON-YYYY') post_date from dual)
  5  select transaction_history.post_date
  6    from (select post_date,
  7                 row_number() over (order by post_date desc) rn
  8            from trans_hist) transaction_history
  9   where transaction_history.rn > 1;
POST_DATE
05-JUN-07
04-JUN-07
SQL> in your code it will be something like:
select t3.a, t3.b
  from (select t2.post_date a, trunc(sysdate - (&num + 1)) b,
               row_number() over (order by t2.post_date desc) rn
          from trans_hist t2
         where t2.post_date >= trunc(sysdate - (&num + 1))
           and 'xxxxxxxxxxxxxxx' in (t2.reference_from_account_id, t2.reference_to_account_id)
           and decode(t2.reference_from_account_id,'xxxxxxxxxxxxxxx',t2.from_account_balance,t2.to_account_balance) = 150) t3
where t3.rn > 1
order by t3.a