SQL Join with a MIN condition

Question

Hello,
I have two tables with the following data:
Table DESIGN
DOC_NO  DOC_TITLE                         CLIENT_DOC_NO
   240     MT/a Process Plant Site Grading General Plan    300-10C-011Table TRACK
FK_TRANS_NO     FK_DOC_NO     DUE_DATE     FK_CLIENT_REV_NO
        269           240     04/05/06                 A
        600           240                           B
        610           240                           B
        623           240     14/07/06                 C
        808           240                           C
        821           240                           C
        844           240                           C
       1036           240                           0
       1262           240                           1
       1341           240                           1
       1372           240                           1
       2567           240                           2
       2570           240                           2
       2576           240                           2The required result is just the lower trans_no for each revision, somethig like this:
CLIENT_DOC_NO   DOC_TITLE                                            TRANS_NO REV  DUE_DATE
300-10C-011       35 MT/a Process Plant Site Grading General Plan           269 A    04/05/06
300-10C-011       35 MT/a Process Plant Site Grading General Plan           600 B
300-10C-011       35 MT/a Process Plant Site Grading General Plan           623 C   
300-10C-011       35 MT/a Process Plant Site Grading General Plan          1036 0    14/09/06
300-10C-011       35 MT/a Process Plant Site Grading General Plan          1262 1
300-10C-011       35 MT/a Process Plant Site Grading General Plan          2567 2So, I apply the MIN function to the TRACK.FK_TRANS_NO field and the result is:
CLIENT_DOC_NO   DOC_TITLE                                            TRANS_NO REV  DUE_DATE
300-10C-011       35 MT/a Process Plant Site Grading General Plan           269 A    04/05/06
300-10C-011       35 MT/a Process Plant Site Grading General Plan           600 B
300-10C-011       35 MT/a Process Plant Site Grading General Plan           623 C   
300-10C-011       35 MT/a Process Plant Site Grading General Plan           808 C    14/07/06      *************
300-10C-011       35 MT/a Process Plant Site Grading General Plan          1036 0    14/09/06
300-10C-011       35 MT/a Process Plant Site Grading General Plan          1262 1
300-10C-011       35 MT/a Process Plant Site Grading General Plan          2567 2 The ******* shows the row that I don't want but I can't remove from the result with any of the options tried right now, this has had me crazy for a couple days.
The SQL used right now is:
SELECT 
     DESIGN.CLIENT_DOC_NO,
        DESIGN.DOC_TITLE,
     TRACK.FK_TRANS_NO "TRANS_NO",
     TRACK.FK_CLIENT_REV_NO "REV",
     TRACK.DUE_DATE
FROM    DESIGN, TRACK
WHERE     (TRACK.FK_DOC_NO=DESIGN.DOC_NO)
     AND (TRACK.TRANS_DATE  IS NOT NULL)
GROUP BY
     DESIGN.CLIENT_DOC_NO,
     DESIGN.DOC_TITLE,
     TRACK.FK_CLIENT_REV_NO,
     TRACK.DUE_DATE
ORDER BY 4;Please if you can help to solve this, best regards.

Answer 1

Yup, thanks for the reminder on the keep keyword... I ended up with
CREATE TABLE design AS (
SELECT 240  doc_no, 'MT/a Process Plant Site Grading General Plan' doc_title, '300-10C-011' client_doc_no FROM DUAL
CREATE TABLE track AS (
SELECT 269 fk_trans_no,   240 fk_doc_no, TO_DATE('04/05/06', 'dd/mm/yy')  due_date,  'A'  fk_client_rev_no FROM DUAL UNION ALL
SELECT 600 fk_trans_no,  240  fk_doc_no,  NULL  due_date,   'B' fk_client_rev_no FROM DUAL UNION ALL
SELECT 610 fk_trans_no,  240  fk_doc_no,  NULL due_date,   'B' fk_client_rev_no FROM DUAL UNION ALL
SELECT 623 fk_trans_no,  240  fk_doc_no,  TO_DATE('14/07/06', 'dd/mm/yy') due_date,   'C' fk_client_rev_no FROM DUAL UNION ALL
SELECT 808 fk_trans_no,   240 fk_doc_no,  NULL  due_date,   'C' fk_client_rev_no FROM DUAL UNION ALL
SELECT 821 fk_trans_no,   240 fk_doc_no,  NULL  due_date,  'C'  fk_client_rev_no FROM DUAL UNION ALL
SELECT 844 fk_trans_no,  240  fk_doc_no,  NULL  due_date,   'C' fk_client_rev_no FROM DUAL UNION ALL
SELECT 1036 fk_trans_no,  240  fk_doc_no, NULL   due_date,   '0' fk_client_rev_no FROM DUAL UNION ALL
SELECT 1262 fk_trans_no,  240  fk_doc_no, NULL  due_date,   '1' fk_client_rev_no FROM DUAL UNION ALL
SELECT 1341 fk_trans_no,  240  fk_doc_no, NULL   due_date,   '1' fk_client_rev_no FROM DUAL UNION ALL
SELECT 1372 fk_trans_no,  240  fk_doc_no, NULL  due_date,   '1' fk_client_rev_no FROM DUAL UNION ALL
SELECT 2567 fk_trans_no,  240  fk_doc_no, NULL   due_date,  '2'  fk_client_rev_no FROM DUAL UNION ALL
SELECT 2570 fk_trans_no,  240  fk_doc_no, NULL   due_date,  '2'  fk_client_rev_no FROM DUAL UNION ALL
SELECT 2576 fk_trans_no,   240 fk_doc_no, NULL   due_date,   '2' fk_client_rev_no FROM DUAL )
SELECT  design.client_doc_no, design.doc_title, track.fk_trans_no "trans_no", track.fk_client_rev_no "rev", track.due_date
   FROM design , (select track.* , rank() over (partition by fk_doc_no, fk_client_rev_no order by fk_trans_no) hmmm from track ) track
  WHERE track.fk_doc_no = design.doc_no and hmmm = 1
ORDER BY 3;
CLIENT_DOC_ DOC_TITLE                                      trans_no r DUE_DATE
300-10C-011 MT/a Process Plant Site Grading General Plan        269 A 04-MAI-06
300-10C-011 MT/a Process Plant Site Grading General Plan        600 B         
300-10C-011 MT/a Process Plant Site Grading General Plan        623 C 14-JUL-06
300-10C-011 MT/a Process Plant Site Grading General Plan       1036 0         
300-10C-011 MT/a Process Plant Site Grading General Plan       1262 1         
300-10C-011 MT/a Process Plant Site Grading General Plan       2567 2         
6 rows selected.
{code}which is of course not so cool  ...  :_|
edit: yeah I just cut the group by stuff away...
Edited by: Slow_moe on Jan 14, 2009 12:05 PM