Remove Duplicate record

Question

Dear All,
I have oracle 10g R2 On windows.
I have table structure like below...
ASSIGNED_TO
USER_ZONE
CREATED
MASTER_FOLIO_NUMBER
NAME
A_B_BROKER_CODE
INTERACTION_ID
INTERACTION_CREATED
INTERACTION_STATE
USER_TEAM_BRANCH
A4_IN_CALL_TYPE
A5_IN_CALL_SUBTYPE
DNT_AGING_IN_DAYS
DNT_PENDING_WITH
DNT_ESCALATION_STAGE_2
DT_UPDATEI use sql loader to load the data from .csv file to oracle table and have assign the value to dt_update sysdate. Everytime i execute the sql loader control file dt_update set as sysdate.
Sometimes problem occures while inserting data through sql loader and half row get insert. after solving the problem again i execute sql loader and hence these duplicate records get inserted.
Now I want to remove all the duplicate records for those dt_update is same.
Please help me to solve the problem
Regards,
Chanchal Wankhade.

Answer 1

Galbarad wrote:
Hi
I think you have two ways
first - if it is first import in your table - you can delete all record from table and run import yet one time
second - you can delete all duplicate records and not running import
try this script
<pre>
delete from YOUR_TABLE
where rowid in (select min(rowid)
from YOUR_TABLE
group by ASSIGNED_TO,
USER_ZONE,
CREATED,
MASTER_FOLIO_NUMBER,
NAME,
A_B_BROKER_CODE,
INTERACTION_ID,
INTERACTION_CREATED,
INTERACTION_STATE,
USER_TEAM_BRANCH,
A4_IN_CALL_TYPE,
A5_IN_CALL_SUBTYPE,
DNT_AGING_IN_DAYS,
DNT_PENDING_WITH,
DNT_ESCALATION_STAGE_2,
DT_UPDATE)
</pre>Have you ever tried that script for deleting duplicates? I think not. If you did you'd find it deleted non-duplicates too. You'd also find that it only deletes the first duplicate where there are duplicates.
XXXX> CREATE TABLE dt_test_dup
  2  AS
  3  SELECT
  4      mod(rownum,3) id
  5  FROM
  6      dual
  7  CONNECT BY
  8      level <= 9
  9  UNION ALL
10  SELECT
11      rownum + 3 id
12  FROM
13      dual
14  CONNECT BY
15      level <= 3
16  /
Table created.
Elapsed: 00:00:00.10
XXXX> select * from dt_test_dup;
        ID
         1
         2
         0
         1
         2
         0
         1
         2
         0
         4
         5
         6
12 rows selected.
Elapsed: 00:00:00.18
XXXX> delete
  2  from
  3      dt_test_dup
  4  where
  5      rowid IN ( SELECT
  6                    MIN(rowid)
  7                 FROM
  8                     dt_test_dup
  9                 GROUP BY
10                     id
11                )
12  /
6 rows deleted.
Elapsed: 00:00:00.51
XXXX> select * from dt_test_dup;
        ID
         1
         2
         0
         1
         2
         0
6 rows selected.
Elapsed: 00:00:00.00