Need help in SQL (DENSE_RANK) function

Question

Hello All,
I need the help in SQL.
We have a table called status and the column are
status_id number
account_id number
status_cd varchar2(10)
created_id varchar2(10)
created_by date
and data is as follows
insert into status values (1,101,'ENTER','ABC',to_date('21-JAN-2007 11:15:14','DD-MON-YYYY HH:MI:SS'));
insert into status values (2,101,'REVIEW','DEF',to_date('21-JAN-2007 11:30:25','DD-MON-YYYY HH:MI:SS'));
insert into status values (3,101,'APPROVE','GHI',to_date('21-JAN-2007 11:30:25','DD-MON-YYYY HH:MI:SS'));
insert into status values (4,102,'ENTER','ABC',to_date('21-JAN-2007 11:18:14','DD-MON-YYYY HH:MI:SS'));
insert into status values (5,102,'REVIEW','DEF',to_date('21-JAN-2007 11:33:25','DD-MON-YYYY HH:MI:SS'));
insert into status values (6,102,'CANCEL','GHI',to_date('21-JAN-2007 11:33:25','DD-MON-YYYY HH:MI:SS'));
insert into status values (7,103,'ENTER','ABC',to_date('21-JAN-2007 11:21:14','DD-MON-YYYY HH:MI:SS'));We have different status as follows
1. ENTER
2. REVIEW
3. APPROVE
4. CANCEL
5. REJECT
My requirement ..
I need the max of created_id column for the status in ('APPROVE','CANCEL') and if there is no status in ('APPROVE','REVIEW') than it should be NULL.
I wrote an SQL as
select account_id,max(created_id) keep (dense_rank first order by decode(status_cd,'APPROVE',created_dt,'REVIEW',created_dt,NULL) DESC NULLS LAST,
      decode(status_cd,'APPROVE',status_id,'REVIEW',status_id,NULL) DESC NULLS LAST) last_app_rev_user
from status
group by account_id and gives me the output like
ACCOUNT_ID LAST_APP_R
       101 GHI
       102 DEF
       103 ABCBut I want the Output like
ACCOUNT_ID LAST_APP_R
       101 GHI
       102 DEF
       103 NULLAs the account 103 has no status called 'REVIEW' and 'APPROVE'
My DB Version in 10.2.0.3.0.
Hope I explain it properly. And if you have any other option without dense_rank still i will be happy.
Thanks in advance for your help.
AB
null
Message was edited by:
AB

Answer 1

instead of max(created_id) keep... use
smth like max(case when status_cd in ('APPROVE','REVIEW') then created_id end) keep...