Qry with non aggregate cols and not in group by clause too.

Question

Hi all,
This is the table.
PROFILE_ID_NO WORK_OK_CD CREATE_DT
7041086 Y 2003-10-07-10.56.42
7041086 Y 2003-10-05-10.56.42
7041086 null 2003-10-06-06.58.08
7041086 N 2004-09-30-05.08.22
I want a qry to pick a profile_id_no and work_ok_cd where create_dt is maximum. I tried
select profile_id_no, work_ok_cd , max(create_dt) from profile group by profile_id_no, work_ok_cd
It gave 3 rows . I dont want that.
I want only the last row to be displayed. How to do that?
Pls help me write this qry .
Thanks
Jaya

Answer 1

user13743192 wrote:
I want a qry to pick a profile_id_no and work_ok_cd where create_dt is maximum.
...Setup:
create table profile (
  PROFILE_ID_NO number
  , WORK_OK_CD  varchar2(1)
  , CREATE_DT   date
alter session set nls_date_format = 'YYYY-MM-DD-HH.MI.SS';
insert into profile values (7041086, 'Y',  '2003-10-07-10.56.42');
insert into profile values (7041086, 'Y',  '2003-10-05-10.56.42');
insert into profile values (7041086, null, '2003-10-06-06.58.08');
insert into profile values (7041086, 'N',  '2004-09-30-05.08.22');
commit;What if there is another row that ties the maximum CREATE_DT?:
insert into profile values (9999999, 'Y',  '2004-09-30-05.08.22');Would you want all rows that match the maximum or only one. If you want all rows, maybe use?:
SQL> select PROFILE_ID_NO, WORK_OK_CD, CREATE_DT
  2  from PROFILE
  3  where CREATE_DT = (select max(CREATE_DT) from PROFILE);
PROFILE_ID_NO W CREATE_DT
      7041086 N 2004-09-30-05.08.22
      9999999 Y 2004-09-30-05.08.22Otherwise, use one of Frank Kulash's queries above, although the first query (using "DENSE_RANK") gives:
PROFILE_ID W CREATE_DT
   9999999 Y 2004-09-30 05:08 amand the second gives:
PROFILE_ID_NO W CREATE_DT
      7041086 N 2004-09-30-05.08.22