Returning latest records based on specific conditions

Question

Hi Everyone, Thanks for everyone response for my queries. All responses are highly appreciated. I need one help in developing Sql query. I am
using Oracle 11.2.
I have table Test as below having columns as, ID;Name;Position;Level;Date_Added;Flag_Name;
Suppose I have below data in table:
ID       Name      Position      Level              Date_Added                Flag_Name
1       Jack       Manager        10         10/29/2013 11:00:00 PM          Match
2       Tom        Supervisor     20            10/31/2013 9:00:00 AM       NoMatch
1       Jack       Manager        15          11/1/2013  10:00:00 AM          Error
1       Jack       Manager        20         10/1/2013  9:00:00 AM           NoMatch
3       John       Salesman      5           10/4/2013  2:00:00 PM           Error
1       Jack       Manager        17         9/28/2013  2:00:00 AM           NoMatch
2       Tom        Supervisor     12         11/2/2013  10:00:00 AM          NoMatch
4       Remy       Accountant     12        11/4/2013  1:00:00 PM           Error
4       Remy       Accountant     19         11/3/2013  2:00:00 AM           Error
2       Tom        Supervisor     10            10/29/2013 7:00:00 PM           Error
I need to return latest data in query based on combination of (ID;Name;Position) and date range with below conditions:
1) Need to return latest records for Flag_Name other than Match.
2) If latest record for combination of (ID;Name;Position) will come with Flag_Name as Error in that specified date range, then we need to look for this combination has Flag_Name as NoMatch anywhere before in table.
3) If Flag_Name as NoMatch is found for this, then we need to return it. In this case also, if we found multiple records with Flag_Name as NoMatch for combination of (ID;Name;Position), then we need to return latest one.
4) Else we find no record for combination of (ID;Name;Position) with Flag_Name as NoMatch in table, then we can return the latest record with Flag_Name as Error.
While select ID;Name;Position should be unique combination, as we always return latest data for it.
As per above table, if I need to return data for date range between 29-Oct-2013 and 5-Nov-2013, expected result will be like below:
ID       Name      Position      Level         Date_Added                      Flag_Name    
1       Jack       Manager        20              10/1/2013  9:00:00 AM           NoMatch
2       Tom        Supervisor     12             11/2/2013  10:00:00 AM          NoMatch
3       John       Salesman        5              10/4/2013  2:00:00 PM           Error
4       Remy       Accountant     12           11/4/2013  1:00:00 PM           Error
Please let me know if anyone has any doubt about the logic. Is it possible if we can do it in select statement rather than pl/sql code?
All comments/suggestions will be highly appreciated.
Thanks in advance.
Regards
Dev    

Answer 1

First i didn't read topic exactly )))
here is second way. I get with stmt from Karthick (thanks)
with t
    as
    select 1 id, 'Jack' name, 'Manager'    position, 10 lvl, to_date('10/29/2013 11:00:00 PM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'Match'   flag_name
      from dual union all
    select 2 id, 'Tom'  name, 'Supervisor' position, 20 lvl, to_date('10/31/2013 09:00:00 AM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'NoMatch' flag_name
      from dual union all
    select 1 id, 'Jack' name, 'Manager'    position, 15 lvl, to_date('11/1/2013  10:00:00 AM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'Error'   flag_name
      from dual union all
  select 1 id, 'Jack' name, 'Manager'    position, 20 lvl, to_date('10/1/2013  09:00:00 AM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'NoMatch' flag_name
    from dual union all
  select 3 id, 'John' name, 'Salesman'   position,  5 lvl, to_date('10/4/2013  02:00:00 PM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'Error'   flag_name
    from dual union all
  select 1 id, 'Jack' name, 'Manager'    position, 17 lvl, to_date('9/28/2013  02:00:00 AM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'NoMatch' flag_name
    from dual union all
  select 2 id, 'Tom'  name, 'Supervisor' position, 12 lvl, to_date('11/2/2013  10:00:00 AM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'NoMatch' flag_name
    from dual union all
  select 4 id, 'Remy' name, 'Accountant' position, 12 lvl, to_date('11/4/2013  01:00:00 PM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'Error'   flag_name
    from dual union all
  select 4 id, 'Remy' name, 'Accountant' position, 19 lvl, to_date('11/3/2013  02:00:00 AM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'Error'   flag_name
    from dual union all
  select 2 id, 'Tom'  name, 'Supervisor' position, 10 lvl, to_date('10/29/2013 07:00:00 PM', 'mm/dd/yyyy hh:mi:ss am') date_added, 'Error'   flag_name
    from dual
select ID,
       Name,
       Position,
       max(lvl) keep (dense_rank first order by с desc, Date_Added desc) lvl,
       max(Date_Added) keep (dense_rank first order by с desc, Date_Added desc) Date_Added,
       min(Flag_Name) keep (dense_rank first order by с desc, Date_Added desc) Flag_Name
from(
select  ID,
            Name,
            Position,
            lvl,
            Date_Added,
            Flag_Name,           
            decode(flag_name, 'Error', -1, 1) с
from T
where flag_name != 'Match'
group by ID,Name,Position
ID
NAME
POSITION
LVL
DATE_ADDED
FLAG_NAME
1
Jack
Manager
20
01.10.2013 09:00:00
NoMatch
2
Tom
Supervisor
12
02.11.2013 10:00:00
NoMatch
3
John
Salesman
5
04.10.2013 14:00:00
Error
4
Remy
Accountant
12
04.11.2013 13:00:00
Error
Ramin Hashimzade
Message was edited by: RaminHashimzadeh