To Determine latest 3 entries in a table

Hello All,
I have a table with the stucture
Table A
PK_ID NUMBER,
Name_ID_FK Number,
Entry_Date Date // Where Entry date is date the row is inserted
This might have data like
1,1,12/12/2001
2,1,12/13/2001
3,2,12/14/2001
4,2,12/15/2001
5,4,12/16/2001
6,5,12/17/2001
and so on...
I want to determine the last (latest) 3 unique entries
i.e in the above case that should return
Name_ID_FK 2,4 and 5
Any help is appreciated.
Thanks in advance,
Sudhindra

sql>select * from a;
    PK_ID NAME_ID_FK ENTRY_DATE
        1          1 12/12/2001
        2          1 12/13/2001
        3          2 12/14/2001
        4          2 12/15/2001
        5          4 12/16/2001
        6          5 12/17/2001
6 rows selected.
sql>select distinct name_id_fk
2    from (select name_id_fk
3            from a
4           order by entry_date desc)
5   where rownum <= 3;
NAME_ID_FK
         2
         4
         5
3 rows selected.
-- What if name_id_fk = 2 has the two most recent dates?
sql>update a set entry_date = entry_date + 10 where name_id_fk = 2;
2 rows updated.
sql>select distinct name_id_fk
2    from (select name_id_fk
3            from a
4           order by entry_date desc)
5   where rownum <= 3;
NAME_ID_FK
         2
         5
-- Should this now return just 2 rows? What is the rule?
2 rows selected.

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REPORT Z_TEST_SELECTION                        .
tables vbap.
data it_vbap type table of vbap.
data it_vbak type table of vbak.
select-options s_vbeln for vbap-vbeln.
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"======================================================================
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" 5
" 6
" 1
" 2
"s_posnr has following entries.
" 10
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select * up to 20 rows from vbap into table it_vbap.
refresh it_vbap.
"Below two cases are absolutely unreliable and I would suggest that a
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"1.
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*900 |0000000001|000010|
*900 |0000000005|000010|
*900 |0000000006|000010|
*900 |0000000002|000010|
"=========================================================
"2.
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*900 |0000000001|000010|
*900 |0000000005|000010|
*900 |0000000006|000010|
refresh it_vbap.
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order by vbeln descending.
write : 'done!'.
refresh it_vbap.
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select * from vbak into table it_vbak where vbeln in s_vbeln
order by vbeln descending.
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\[removed by moderator\]
Regards
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Edited by: Jan Stallkamp on Aug 25, 2008 4:39 PM

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select sale_date,sum(sale_amt) total_sale
from
select empno,0 sale_amt,(sale_date + ao.rn) sale_date
from
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from
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~~~~Guess this will serve the purpose...
Cheers Arpan

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http://connect.microsoft.com/SQLServer/feedback/details/346786/ssms-does-not-support-job-schedule-frequencies-greater-than-60-minutes
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Message was edited by:
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To Determine latest 3 entries in a table

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