How To Delete Duplicate Records From A Table

Nov 29, 2004

Hello All,

Please show me how to delete duplicate records from a table.


Thanks in Advance

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How To Delete Duplicate Records From A Table ?

Jul 20, 2005

I uploaded some data about 2 or 3 times and it keep appending it to thetable.Now I want to keep only first duplicate and delete rest of.Suppose part number 123 has been added 3 times so I want to keep only 1record.Thanks

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How To Delete Duplicate Records From Table ?

Mar 4, 2008

Hello Frnds....Can anybody give the answer of this question as How to Delete duplicate records from Table ?
I Know that with check option and also with Unique Constraint we can avoid to enter duplicate records in table but How to delete from table which does not have any constraints ?

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Delete Duplicate Records

Jul 30, 2004

I use a tabel for storin log data from a mail server. I noticed that I'm getting duplicate records, is there a way to delete the socond and/or third entry so I dont have any duplicates?

I need this done in SP.

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Delete Duplicate Records

Oct 19, 2000

Sorry for the new thread.

I have a userprofile table. There are a lot of duplicate records in this table. e.g.

USERID-----LASTNAME---EMAILADDRESS----CREATEDATE
----------------------------------------------------------------------
1----------A-----------A@yahoo.com---------2000-09-05 16:07:00.000
2----------A-----------A@yahoo.com---------2000-09-10 16:07:00.000
3----------A-----------A@yahoo.com---------2000-09-15 16:07:00.000

Userid is auto number, lastname and emailaddress are PK.

I want to delete duplicate records. If lastname and emailaddress are the same, only keep a record which createdate is the most newest date. See above example I only want to the record which userid is 3. I have alreday created a code which I attached below. This code onle keep a record which userid is 1.

Anybody can help me to solve this problem? Thanks.

============== My current code ====================
delete from userprofile where userprofile.userid in
--list all rows that have duplicates
(select p.userid
from userprofile as p
where exists
(select lastname, emailaddress
from userprofile
where lastname = p.lastname and emailaddress = p.emailaddress
group by lastname, emailaddress
having count (userid)>1))
and userprofile.userid not in
--list on row from each set of duplicate
(select min(p.userid)
from userprofile as p
where exists
(select lastname, emailaddress
from userprofile
where lastname = p.lastname and emailaddress = p.emailaddress
group by lastname, emailaddress
having count (userid)>1)
group by lastname, emailaddress)

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Delete Duplicate Records

May 7, 2008

Hello everyone,

I have a little dilemma. I have a table ALLTABLE that has duplicate records and I want to delete them. ALLTABLE has these columns with these values for example:

Policy Premium Class State Entity Number
ADC-WC-0010005-0 25476 63 31 1
ADC-WC-0010005-0 25476 63 31 2
ADC-WC-0010005-0 25476 63 31 3
ADC-WC-0010005-0 1457 63 29 4
ADC-WC-0010092-1 2322 63 37 1
ADC-WC-0010344-0 515 63 01 1
ADC-WC-0010344-0 515 63 01 2

As you can see there is some duplicates in the first 3 rows and the final 2 (the entity number is the only difference). I want the table to look like this:

Policy Premium Class State Entity Number
ADC-WC-0010005-0 25476 63 31 1
ADC-WC-0010005-0 1457 63 29 4
ADC-WC-0010092-1 2322 63 37 1
ADC-WC-0010344-0 515 63 01 1

Thank you so much for the help. It is really appreciated.

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How Can I Delete Duplicate Records

Jun 5, 2008

Hi Guys,

I have the following table
customerid customername
------------------------
1 AAA
1 AAA
2 BBB
2 BBB
2 BBB
3 CCC
3 CCC

Here, I need to delete duplicate records from the above table.
After deleting the duplicate records the table should be
like this:
customerid customername
------------------------
1 AAA
2 BBB
3 CCC


Can any one help me!!!!!!

Regards
js.reddy

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Delete Duplicate Records

Jun 24, 2008

Hi,
Please help me in constructing a query that will delete duplicate records in a table;
Please see my table structure below:

CREATE TABLE LATEST_DATA (
[ID] int NOT NULL,
[IPage] varchar(100) NULL,
[IDevice] varchar(255) NULL,
[IGroup] varchar(255) NULL,
[IField] varchar(255) NULL,
[IValue] varchar(255) NULL,
[IIcon] int NULL,
[IID] int NULL,
[ReportID] int NOT NULL,
[RVersion] varchar(255) NULL,
[RHost] varchar(255) NULL,
[RUser] varchar(255) NULL,
[RLocation] varchar(255) NULL,
[RDateTime] varchar(16) NULL,
[RComplete] bit NOT NULL
);

-- Insert Latest data
INSERT
INTO LATEST_DATA
SELECT
[Item].[ID],
[Item].[IPage],
[Item].[IDevice],
[Item].[IGroup],
[Item].[IField],
[Item].[IValue],
[Item].[IIcon],
[Item].[IID],
[Item].[ReportID] ,
[Report].[RVersion],
[Report].[RHost],
[Report].[RUser],
[Report].[RLocation],
[Report].[RDateTime],
[Report].[RComplete]
FROM
[dbo].[Item],
[dbo].[Report]
WHERE
[Report].[ID] = [ITEM].[ReportID] AND
[Report].[ID] = ( SELECT
MAX([Report].[ID])
FROM
[dbo].[Report]
);


thanks

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Have Duplicate Records, Can't Delete Extras!

Apr 9, 2008

I have inherited a database with no primary keys in it. :(

There are, of course, duplicate records by the "logical key", i.e., the list of columns that should have been used in a primary key, if they only had one. I can easily identify when I have duplicate records using group by and having clauses.  That's the easy part.I can identify duplicate records by "key columns" and the subset of those records that are "identical duplicates on all columns".  I need to delete the "extra copies"

I can't do it by hand using sql server manager, it won't let me, because it recognizes that more than one row matches that row. In Oracle, I would use the pseudo-column "rowid", which would expose the internal identifier for the row.SqlServer doesn't appear to have this concept. is there another way other than creating an empty shadow table, copying all the distinct duplicate records into the shadow table, deleting all the duplicates in the old table, then copying the distinct duplicates back into the old table. 

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Delete Duplicate Records Without Primary Key

Feb 5, 2012

I want to delete the duplicate record from a table keeping 1 record aside.

My base table is-info

idnameclass
2abc6a
3abc6a
4abc6a
1abc6a
2abc6a
4abc6a
4abc6a
3abc6a
3abc6a
1abc6a
2abc6a
5abc6a

id-int
name-text
class-varchar
(there is no primary key in this table)

Now I want the result in following way:
idnameclass
2abc6a
3abc6a
4abc6a
1abc6a

I have tried the following query and its running fine but its not a dynamic stuff.

DELETE top (SELECT COUNT(*)-1 FROM aaa WHERE id ='3') --or put some number
FROM aaa
WHERE id ='3'-- or put some number

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Jul 7, 2007

I was importing records via DTSWizard, and I was having problems so I turned off Enforce Replicaton, Enforce FK Constraints on a couple of fields. I'm new with SQL Server so I'm not sure if this even caused the problem. (Do I need to turn these back on, or is this a Developer switch of some kind?)



The end result left me with duplicate records in the table, and I'm not able to delete any of them. This is the Error I got...



A problem occurred attempting to delete row 1.
Error Source: Microsoft.VisualStudio,Datatools.
Error Message: The row value(s) updated or deleted either do not make the row unique or they after multiple rows(2 rows).



If someone could tell me what I need to do so I can delete the records I'd really appreciate it.



Thanks,

Bill

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Delete And Merge Duplicate Records From Joined Tab

Oct 21, 2014

Im trying to delete duplicate records from the output of the query below, if they also meet certain conditions ie 'different address type' then I would merge the records. From the following query how do I go about achieving one and/or the other from either the output, or as an extension of the query itself?

SELECT
a1z103acno AccountNumber
, a1z103frnm FirstName
, a1z103lanm LastName
, a1z103ornm OrgName
, a3z103adr1 AddressLine1
, A3z103city City

[Code] ....

Delete and merge duplicate records from joined tables? I am trying to delete duplicate records from the output of the query below, if they also meet certain conditions ie 'different address type' then I would merge the records. From the following query how do I go about achieving one and/or the other from either the output, or as an extension of the query itself?

Select a1z103acno AccountNumber, a1z103frnm FirstName, a1z103lanm LastName, a1z103ornm OrgName, a3z103adr1 AddressLine1, A3z103city City, A3z103st State, A3z103zip Zip, a6z103area AreaCode, a6z103phon PhoneNumber, a8z103mail Email from proddta.fz103a1 with (nolock) inner join proddta.fz103a2 with (nolock) ON a1z103acno = a2z103acno INNER JOIN proddta.fz103a3 with (nolock) ON a2z103adid = a3z103adid and a2z103actv = 'Y' and a2z103prim = 'Y' LEFT OUTER JOIN proddta.fz103a5 with (nolock) ON a1z103acno = a5z103acno and a5z103actv = 'y' and a5z103prim = 'Y' INNER JOIN proddta.fz103a6 with (nolock) ON a5z103phid = a6z103phid LEFT OUTER JOIN proddta.fz103a8 with (nolock) ON a1z103acno = a8z103acno and a8z103actv = 'Y' and a8z103prim = 'Y'

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Jul 20, 2005

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Hi,I have an sql database that has the primary key set to three fields,but has not been set as unique(I didn't create the table).I have 1 record that has 2 duplicates and I am unable to delete theduplicate entries.If I try to delete any of the three records(they are identical) I getthe message 'key column is insufficient or incorrect. Too many rowswere affected by update'.I am trying to do this within Enterprise Mgr.Any suggestion?Thanks much

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Im trying to delete duplicate records from the output of the query below, if they also meet certain conditions ie 'different address type' then I would merge the records. From the following query how do I go about achieving one and/or the other from either the output, or as an extension of the query itself?

SELECT
a1z103acno AccountNumber
, a1z103frnm FirstName
, a1z103lanm LastName
, a1z103ornm OrgName
, a3z103adr1 AddressLine1
, A3z103city City
, A3z103st State

[code]...

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Nov 6, 2014

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Currently i am doing this in excel, i delete duplicate data in excel and upload again whole data in sql.

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Jul 21, 2015

I have a table with more than 1000 records. The columns look like this

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Some of the rows are duplicates except for the fact that they have different values for the first column alone (import id)

11111      test   21-07-2015   xxxxxx   yyyyyy
22222      test   21-07-2015   xxxxxx   yyyyyy

Is it possible to delete these kind of duplicate rows by ignoring the import id ?

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Sep 3, 2007

I am using Sql Server 2000.
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One excel file will contain thousands of customer.
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If I do it in my VB.Net coding.then application gets drastically slow.
So I want to write a procedure or trigger for this.
Here what I will do, I will send all records into database then this trigger or procedure will check for
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Oct 5, 2007

Hello friends,
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emp_id              emp_name
1                          aa
2                          bb
3                          cc
1                          aa
3                          cc
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and i want the result is like
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1                       aa
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May 16, 2008

Hello,

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Jul 20, 2005

I just discovered that all my records appear twice inside my table, inother words, they repeat on the row below. How can I delete all of theduplicates? I'm sure there must be a tidy line of sql to do that.Thanks,Bill

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Apr 3, 2008

Hi Guyz

say i have a table


10011 NULL NULL Classical NULL
10011 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
10005 NULL NULL Classical NULL

i want to eliminate the duplicate records and atable should look like

10011 NULL NULL Classical NULL
10004 NULL NULL Classical NULL
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do we have any simple sql to do it or something complex.
thanks in advance !

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Jul 6, 2006

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TAI,



barkingdog

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Oct 19, 2014

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Master table name is Flatfile_Inventory
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Child Tables name are INVENTORY_AMOUNT,INVENTORY_DETAILS,INVENTORY_VEHICLE,
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-- ===============================================================================================
-- STORED PROCEDURE FOR FLATFILE_INVENTORY
-- ===============================================================================================
USE [IconicMarketing]
---=======================================SALES_CURSUR===========================================
--USE IconicMarketing
--GO
DECLARE
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@ACDealerID varchar(50) ,

[code].....

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Oct 8, 2015

any useful SQL Queries that might be used to identify lists of potential duplicate records in a table?

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1 | Smith | John Raymond | NULL | NI990946B | SW12 8TQ
2 | Smith | John | 06/03/1967 | NULL | SW12 8TQ
3 | Smith | Jon Raymond | 06/03/1967 | NI 99 09 46 B | SW12 8TQ

The problem is that whilst it is easy for a human being to review these 3 entries and conclude that they are most likely the same Client entered in to the database 3 times; I cannot find a reliable way of identifying them using a SQL Query.

I've considered using some sort of concatenation to a new column, minus white space and then using a "WHERE column_name LIKE pattern" query, but so far I can't get anything to work well enough. Fuzzy Logic maybe?

the results would produce a grid something like this for the example above:

ID | Surname | Forenames | DuplicateID | DupSurname | DupForenames
1 | Smith | John Raymond | 2 | Smith | John
1 | Smith | John Raymond | 3 | Smith | Jon Raymond
9 | Brown | Peter David | 343 | Brown | Pete D
next batch of duplicates etc etc . . . .

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I have this table:

id | Name | Age
==================
1 | AAA | 22
1 | AAA | 22
2 | BBB | 33
2 | BBB | 33
2 | BBB | 33
3 | CCC | 44
4 | DDD | 55

I need to delete from this table all the duplicate records and leave only one record. The table will looks like this:

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==================
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2 | BBB | 33
3 | CCC | 44
4 | DDD | 55

I work with sqlCE for Mobile...

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What is the syntax to delete records from Table1 using Table1.Name='some name' and remove any records in Table2 that have Table2.table1Id equal to Table1.table1Id?

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Jul 20, 2005

:confused: Urgent!!
Hi there. I use MS SQL server. I would like to separate the data from one table to two tables refer to two reference tables and the following conditions:

Let say these two reference tables are called:
Table A & Table B

Group A:
1. Same date in Table A & Table B
2. Same ID in Table A & Table B (ID is not unique)
3. Same name in Table A & Table B (Name is not unique)

Combine all of these three conditions for unique identifier.

I used the following SQL code to separate the required data that match the above conditions to the new table.
(Code)
select a.Project, a.Site, a.S_number, a.Field_ID, a.Method, a.Analyte, a.Result, a.Units,
a.Qualifier, a.Dilution_Factor, a.Reporting_limit, a.Recovery_, a.Matrix, a.CAS_Number, a.Sample_Date,
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a.Lab into APPL_union_exist from APPL_union_update a, Before_01012004_report b
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However, I don't know how to delete the data that copied to the new table in original table, or separate that to the new table. Wish someone can help me. Thanks a lot

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Oct 6, 2006

hi,
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One can never consent to creep,when one feels an impulse to soar
RAMMOHAN

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