SQL & PL/SQL :: Delete Duplicate Records From A Table

Apr 13, 2011

I need to delete duplicate records from a table (indeed they are multiple duplicates).

Table Data

IDGroupQty
1KK30
1KK0
1KK19
2AA0
2AA30
3AA0
3AA30
3AA30
3AA9

My aim is to delete duplicates out of above data, with the below condtions.

1) first record with value 30 and then with value 0.
2) if there are 3 duplicate records ex: ID is 1 and Group KK, then i have to delete both 30 & 0 qty records.
3) If there are more than 3 duplicate records ex: ID is 3 and Group is AA, the i have to delete all the records with qty value either 30 or 0 and.

I have written a query like below.

SELECT id,
unit,
RANK ()
OVER (PARTITION BY id, unit
ORDER BY id, unit)
num
FROM temp;

with the above query, i am unable to mark this dynamic duplications.

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Aug 30, 2010

How can i delete duplicate records from the table.

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Sep 29, 2010

say I have duplicate records in TABLE3, can I use following SQL to delete the duplicates?FYI, BUS_FID is unique number column.

TABLE3
------------------------
ori_id*************id***********r_f_a****r_t_a*******bus_id
72840000040572*****740040572****255******267*********1
72840000040572*****740040572****255******267*********2
2840000040572******20040572*****25*******27**********3
7840000040572******70040572*****2********6***********4

DELETE FROM TABLE3 WHERE BUS_ID NOT IN (SELECT MIN(BUS_ID) FROM TABLE3 GROUP BY ORI_ID);

consider TABLE3 has millions of millions of data, say 40 millions.Update, I have tried it and it is very slow...

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I want to delete the duplicate records from a table without using Below 2 methods:

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Dec 22, 2012

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My table(tab2) Structure is

DEPTNODEPT_NAMEEMPIDSEXID1
107jadf 1F1
40asdf 55
10purchase 2M2
10sales 3M3
30HR 4F4

I found the Duplicate Record by using the query

with a as
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how to delete duplicate record .

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Sep 8, 2008

In oracle 9i ........How to delete duplicate entries in a table ?

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Note:
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--->No Primary Key
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May 12, 2011

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But Problem is After delete the duplicate record When I have use Below statement

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[Code]....

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Aug 22, 2012

I have a table like this

table:

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I tried with rowid but it deletes either both normal or both special or returns same code for normal and special.

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Mar 1, 2010

I want to delete the duplicate rows in a table without using ROWID.

I have the following data.

SNO SNAME SECTION
1 RAM A
2 SHYAM B
2 SHYAM B
3 KISHOR C
3 KISHOR D
4 RAMESH E
5 RAJESH F
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SNO SNAME SECTION
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2 SHYAM B
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Sep 29, 2011

How can I delete the duplicate combination of records from the below table.

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[code]....

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Expected result after deletion

GID PID
---------- ----------
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25 46
89 64
15 16
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Aug 3, 2010

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Apr 8, 2012

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May 20, 2010

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example

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i want to update the flag

if count are same then update one of record (flag='A') and other should be flag='R'
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[Code]....

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Dec 20, 2012

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for one particular employee, he is having multiple records with the same data in the table

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-------------------------------------------------------
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[Code]....

like this am having multiple times the duplicates.

I have written the below query to delete the duplicate records. But it is deleting only one record (if we have 5 duplicates it is deleting only 1 ). But I am looking to delete if we have 5 duplicates need to delete 4 duplicates and keep 1 record in the table.

query which am using to delete the duplicates is

DELETE FROM Table1 a 
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Dec 16, 2010

I am trying to write SQL which finds records which are duplicated in more than one column.

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My Source table:

COL1COL2COL3COL4
163kg87
263fh87
1ab23
2ab24
3cd98
4fg87
5xy77
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Desired Output

COL1COL2COL3COL4
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2ab24
5xy77
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For Table generation

CREATE TABLE TEMP_TEST
(
COL1 NUMBER,
COL2 VARCHAR2(10 BYTE),
COL3 VARCHAR2(10 BYTE),
COL4 NUMBER
)

Insert statements

Insert into TEMP_TEST
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[code]....

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Existing Data
------------------
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[code]....

get the result using a single update statement.

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Aug 30, 2012

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INSERT INTO A_TEST (A,B,C,D) VALUES(1,2,3,4);
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I would like to perform an update on the FLAG column by setting to "D" if it is a duplicate record.1,2,3,4);I would like to use the rank function.

Desired update:

A B C D FLAG
1 2 3 4
2 4 5 8
1 2 3 4 D
2 4 5 8 D
7 2 3 4
9 2 3 4
7 2 3 4 D
1 2 3 4 D
5 4 5 8
2 2 3 9
2 4 5 8
6 2 3 4
1 3 3 4
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Nov 16, 2011

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select distinct comp_id as compid,
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[Code]....

output
-----------------
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20097 JMT 9486 GTL
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[code]...

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