DELETE DUPLICATE ROWS

i have a wage table where wage id is sequence generated column
here is the sample data ..like this i have so many records but if i know how to delete for 1 record i can do for the rest.
wage id account_no period wage
712345 1111 20033 3000
712360 1111 20033 3000
712361 1111 20034 3000
712324 1111 20041 4000
The second row is a duplicate data because for 2003 3rd quarter there is a duplicate record ... how do u delete it.
Thank you for your help in advance ...
Edited by: Data Boy on Dec 30, 2009 10:43 AM

SQL> select * from your_table;
   WAGE_ID ACCOUNT_NO     PERIOD       WAGE
    712345       1111      20033       3000
    712360       1111      20033       3000
    712361       1111      20034       3000
    712324       1111      20041       4000
SQL> delete from your_table a
2 where exists ( select null
3                 from ( select wage_id
4                        ,      row_number() over (partition by account_no, period order by wage_id ) rn
5                        from   your_table
6                      ) b
7                 where b.rn>1
8                 and   a.wage_id = b.wage_id
9                );
1 row deleted.
SQL> select * from your_table;
   WAGE_ID ACCOUNT_NO     PERIOD       WAGE
    712345       1111      20033       3000
    712361       1111      20034       3000
    712324       1111      20041       4000

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How to delete duplicate row in certain case

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status
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0001
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0006
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Hi Rob,
Just trying to chip in little bit!
Created Table As follows same as you, only two rows with duplicatem user, datein, and timein:
create table table1
as
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Here problem is that its not able to delete duplicate rows having same timein and timeout.
So I changed you query as follows:
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<div style="border: 1pt solid windowtext; padding: 1pt 4pt">
{size:9pt}SQL> select * from
v$version;{size}
{size:9pt} BANNER
----------------------------------------------------------------{size}
{size:9pt}Oracle Database 10g Express
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Source
EMPID NAME CIY
1001 A MACH1
1001 A MACH2
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1002 C MAH1
1002 A MAH1
1003 X MACH12
1003 X MACH1
Output:
I just want to delete duplicate based on CIY='MAH1'
EMPID NAME CIY
1001 A MACH1
1001 A MACH2
1002 B MAH1
1003 X MACH12
1003 X MACH1
I tried with this query but it actually considers all the duplicaes in the table ......
DELETE FROM test00 WHERE rowid NOT IN (SELECT max(rowid) FROM test00 WHERE ITEM='A'AND GROUP BY item )
Thanks in advance
Ananda.

Something like this ->
SCOTT>
SCOTT>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE 10.2.0.3.0 Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
Elapsed: 00:00:00.04
SCOTT>
SCOTT>
SCOTT>create table ananda
2 as
3 (
4 select 1001 EMPID, 'A' N_AME, 'MACH1' CITY from dual
5 union all
6 select 1001, 'A', 'MACH2' from dual
7 union all
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9 union all
10 select 1002, 'C', 'MAH1' from dual
11 union all
12 select 1002, 'A', 'MAH1' from dual
13 union all
14 select 1003, 'X', 'MACH12' from dual
15 union all
16 select 1003, 'X', 'MACH1' from dual
17 );
Table created.
Elapsed: 00:00:00.18
SCOTT>
SCOTT>
SCOTT>select * from ananda;
 EMPID N CITY
 1001 A MACH1
 1001 A MACH2
 1002 B MAH1
 1002 C MAH1
 1002 A MAH1
 1003 X MACH12
 1003 X MACH1
7 rows selected.
Elapsed: 00:00:00.09
SCOTT>
SCOTT>
SCOTT>delete from ananda
2 where city = 'MAH1'
3 and rowid NOT IN (
4 select rr
5 from (
6 select rowid rr,
7 empid,
8 n_ame,
9 city,
10 row_number() over(partition by city order by empid) rn
11 from ananda
12 where city = 'MAH1'
13 )
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15 );
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Elapsed: 00:00:00.10
SCOTT>
SCOTT>select * from ananda;
 EMPID N CITY
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 1001 A MACH2
 1002 B MAH1
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Elapsed: 00:00:00.09
SCOTT>Regards.
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