Getting the last set of records based on a Date Field

Hi All
i have the followings data set in a table
TRACK_ID_GRP     TRACK_ID_NBR     TRACK_SAMPLE_ID     START_DATE
970150                      129700104071     64260                        8/6/2002
970150                      229700101893     64261                        8/6/2002
970150                     149700101893     64262                        8/6/2002
970150                       97015011     79252                        9/19/2005
970150                       97015023     79255                        9/19/2005
970150                       97015013     79253                         9/19/2005
970150                       97015021     79254                        9/19/2005
970040                      129900105213     56155                         9/26/2000
970040                                 1101     29841                        6/9/1998
970040                       97004023     143349                        10/28/2008
970040                              2101     29842                        6/9/1998
970040                        97004021     143348                        10/28/2008
970040                       97004011     143346                        10/28/2008
970040                      149700101903     64196                       7/16/2002
970040                              2301     29844                      6/9/1998
970040                         97004013     143347                         10/28/2008
970040                                  1301       29843                        6/9/1998I need to get only those records with the latest date and i'm using the following query
SELECT t.track_id_grp, t.track_id_nbr, t.track_sample_id,
       MAX (t.start_date) OVER (PARTITION BY t.track_id_grp) AS start_date
FROM track_table t
WHERE t.track_id_grp IN ('970150', '970040')And i'm getting the following dataset
TRACK_ID_GRP     TRACK_ID_NBR     TRACK_SAMPLE_ID     START_DATE
970040                      1.299E+11     56155     10/28/2008
970040                      1101                     29841     10/28/2008
970040                      97004023                     143349     10/28/2008
970040                      2101                     29842     10/28/2008
970040                      97004021                     143348     10/28/2008
970040                      97004011                     143346     10/28/2008
970040                      1.497E+11     64196     10/28/2008
970040                      2301                     29844     10/28/2008
970040                      97004013                     143347     10/28/2008
970040                      1301                     29843     10/28/2008
970150                      1.297E+11     64260     9/19/2005
970150                      97015011                     79252     9/19/2005
970150                      97015021                     79254     9/19/2005
970150                      2.297E+11     64261     9/19/2005
970150                      97015013                     79253     9/19/2005
970150                      97015023                     79255     9/19/2005
970150                      149700101903     64262     9/19/2005And i was expecting the following dataset
TRACK_ID_GRP     TRACK_ID_NBR     TRACK_SAMPLE_ID     START_DATE
970150                      97015011                             79252     9/19/2005
970150                      97015023                             79255     9/19/2005
970150                      97015013                             79253     9/19/2005
970150                      97015021                             79254     9/19/2005
970040                      97004023                             143349     10/28/2008
970040                      97004021                             143348     10/28/2008
970040                      97004011                             143346     10/28/2008
970040                      97004013                             143347     10/28/2008I was expecting to get only those records with the latest date, instead i'm getting all the records with the max date in it, please need help or advice.
Thanks

Try this -
SELECT track_id_grp, track_id_nbr, track_sample_id, start_date
FROM (SELECT t.track_id_grp, t.track_id_nbr, t.track_sample_id,
               t.start_date,
               ROW_NUMBER () OVER (PARTITION BY t.track_id_grp, t.track_sample_id ORDER BY t.start_date DESC)
                                                                        AS rn
          FROM track_table t
         WHERE t.track_id_grp IN ('970150', '970040'))
WHERE rn = 1let me know if that works.
Edited by: Sri on Apr 28, 2011 9:24 AM

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