Query in analytic function

Question

Hi,
I am using below query
select * from
SELECT FLAG,S_DATE,ROW_NUMBER() OVER (PARTITION BY
flag order by S_DATE,FLAG ) as d
FROM table_name
ORDER BY S_DATE
which gives below output
Flag     | S_DATE      | D
Y     | 2/27/2012 5:33     |     1
Y     | 2/27/2012 5:34     |     2
Y     | 2/27/2012 5:34     |     3
N     | 2/27/2012 5:34     |     1
N     | 2/27/2012 5:34     |     2
N     | 2/27/2012 5:34     |     3
N     | 2/27/2012 5:35     |     4
N     | 2/27/2012 5:35     |     5
Y     |  2/27/2012 5:36     |     4
Y     |  2/27/2012 5:36     |     5
Y     |  2/27/2012 5:36     |     6
But i want the output to be in below order there is change in last 3 rows
Flag     | S_DATE      | D
Y     | 2/27/2012 5:33     |     1
Y     | 2/27/2012 5:34     |     2
Y     | 2/27/2012 5:34     |     3
N     | 2/27/2012 5:34     |     1
N     | 2/27/2012 5:34     |     2
N     | 2/27/2012 5:34     |     3
N     | 2/27/2012 5:35     |     4
N     | 2/27/2012 5:35     |     5
Y     |  2/27/2012 5:36     |     1
Y     |  2/27/2012 5:36     |     2
Y     |  2/27/2012 5:36     |     3
ihave used the analytic function.
Edited by: user8858890 on Feb 27, 2012 2:00 AM

Answer 1

Hi,
user8858890 wrote:
... But i want the output to be in below order there is change in last 3 rows
Flag     | S_DATE      | D
Y     | 2/27/2012 5:33     |     1
Y     | 2/27/2012 5:34     |     2
Y     | 2/27/2012 5:34     |     3
N     | 2/27/2012 5:34     |     1
N     | 2/27/2012 5:34     |     2
N     | 2/27/2012 5:34     |     3
N     | 2/27/2012 5:35     |     4
N     | 2/27/2012 5:35     |     5
Y     |  2/27/2012 5:36     |     1
Y     |  2/27/2012 5:36     |     2
Y     |  2/27/2012 5:36     |     3
Why do you want the last 3 rows (which have flag = 'Y') to be numbered 1, 2, 3, when the first 3 rows (which also have flag = 'Y') already have numbers 1, 2 and 3? Do you want a separate #1 whenevever there is a group of consecutive rows (when ordered by s_date) that have the same flag? If so, then you have to identify the groups, like this:
WITH     got_grp_id     AS
     SELECT     flag
     ,     s_date
     ,     ROWID               AS r_id
     ,     ROW_NUMBER () OVER ( ORDER BY      s_date
                               ,                  ROWID
           - ROW_NUMBER () OVER ( PARTITION BY  flag
                                     ORDER BY          s_date
                         ,               ROWID
                       )    AS grp_id
     FROM    table_name
SELECT       flag
,       s_date
,       ROW_NUMBER () OVER ( PARTITION BY  flag
                             ,          grp_id
                      ORDER BY          s_date
                      ,               r_id
                    )      AS d
FROM      got_grp_id
ORDER BY  s_date
,            grp_id
,       d
;This assumes that each row can be uniquely idendified, so that the order is unambiguous. In your sample data, there are completely identical rows, so I used ROWID to uniquely identify the rows. Using ROWID assumes that table_name is a real table, not just a result set.
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using.