Comments on: Delete Duplicate Records

By: Babita

Babita — Fri, 23 Jul 2010 05:20:23 +0000

Very good post.

By: Articles about @@rowcount volume 6 « Article Directory

Articles about @@rowcount volume 6 « Article Directory — Sat, 12 Jun 2010 14:59:35 +0000

[...] Delete Duplicate Records | SQL Lion … from a table without affecting the integrity of the database by using TOP Keyword, SET ROWCOUNT command, IDENTITY column property and by Filtering … [...]

By: FEBRIE DHARMA KUNCORO

FEBRIE DHARMA KUNCORO — Tue, 21 Jul 2009 08:41:41 +0000

Hi,usually i use this simple logic to delete duplicate records.

CREATE PROC dbo.DELETE_DUPLICATE_RECORD
AS
BEGIN
— Group duplicate table using distinct to temp table
SELECT DISTINCT * INTO Single_Result FROM Original_table
— Clear all data from source table
TRUNCATE TABLE Original_table
— Copy from temp table to source table (original table)
INSERT INTO Original_table
SELECT * FROM Single_Result
END
GO

Hope this is more helpful!

Cheers!

FEBRIE

By: Lal

Lal — Wed, 10 Jun 2009 21:55:36 +0000

Hi all, another way to find duplicates and remove duplicate.

This query will help you to find the duplicates rows

;WITH CTE(RowNum,CarCompany,CarBodyType,CarName, EngineType)
AS
(
SELECT ROW_NUMBER() OVER(PARTITION BY CarCompany,CarBodyType,CarName, EngineType
ORDER BY CarCompany,CarBodyType,CarName, EngineType) as RowNum,
CarCompany,CarBodyType,CarName, EngineType
FROM TEST.[dbo].[CARS]
)
SELECT * FROM CTE WHERE RowNum >1

To delete/remove the duplicate Please execute the below query.

Hope this is helpful.

Lal

By: Arun Mallick

Arun Mallick — Fri, 29 May 2009 16:35:00 +0000

Dear Readers,
Here is another way of deleting redundant rows by using IDENTITY column.
DELETE FROM dbo.Cars
WHERE
EXISTS
(SELECT IdentityColmn FROM dbo.Cars T
WHERE T.CarCompany = dbo.Cars.CarCompany and T.CarBodyType= dbo.Cars.CarBodyType and T.CarName= dbo.Cars.CarName and T.EngineType = dbo.Cars.EngineType AND T.IdentityColmn < dbo.Cars.IdentityColmn)

Thanks.