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delete duplicates


delete duplicates

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kumar99ms
kumar99ms
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Hi Every body,

I have one table Employees

EmpID EmpName
1 aaa
1 aaa
2 aaa
3 bbb
2 bbb

Here in my table dont have primary key to that EMPID how can i eliminate duplicates in my table am using self joins but it is not working could any body help me plz really appreciate to you

Thanks
Sriram-288748
Sriram-288748
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A good method for deleting duplicates is using CTE.

it is nicely explained in the msdn site. http://msdn.microsoft.com/en-us/library/ms190766(SQL.90).aspx

Hope the above helps.

Sriram

Sriram
ChiragNS
ChiragNS
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One common method is to move the data into another table (same structure as emp table)and drop the original emp table and rename the new table.

Create table NewEmp.....

SELECT DISTINCT EmpID,Empname INTO NewEmp
From Emp

Drop Emp

sp_rename 'NewEmp' , 'Emp'

"Keep Trying"
kumar99ms
kumar99ms
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Hi Thank you for ur reply,


in that EMPID dont have primary key is it possible that one because it is very big database plz help me
Ramesh Saive
Ramesh Saive
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Here is a CTE based solution....


; WITH EmployeesCTE
AS
(
SELECT ROW_NUMBER() OVER( PARTITION BY EmpID, EmpName ORDER BY EmpID ) AS RowNumber,
EmpID, EmpName
FROM Employees
)
DELETE
FROM EmployeesCTE
WHERE RowNumber != 1



--Ramesh


Vijaya Kadiyala
Vijaya Kadiyala
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if the table is small then create a new table with the distinct values and then drop the old table and rename the new table to the Old table name.

Thanks -- Vijaya Kadiyala
http://dotnetvj.blogspot.com

Thanks -- Vijaya Kadiyala
www.dotnetvj.com
SQL Server Articles For Beginers



rcassis-1001343
rcassis-1001343
SSC Rookie
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Here is a CTE based solution....

; WITH EmployeesCTE
AS
(
SELECT ROW_NUMBER() OVER( PARTITION BY EmpID, EmpName ORDER BY EmpID ) AS RowNumber,
EmpID, EmpName
FROM Employees
)
DELETE
FROM EmployeesCTE
WHERE RowNumber != 1



--Ramesh

This is elegant...
SQLRNNR
SQLRNNR
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There are already a couple of solutions proposed that use a CTE. I would recommend picking a CTE solution.



Jason AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server, MVP


SQL RNNR

Posting Performance Based Questions - Gail Shaw

Mitesh Oswal
Mitesh Oswal
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DECLARE @tbl TABLE
(
EMPID INT,
EmpName VARCHAR(100)
)

INSERT INTO @tbl
SELECT
1, 'aaa'
UNION ALL
SELECT
1, 'aaa'
UNION ALL
SELECT
2, 'aaa'
UNION ALL
SELECT
3, 'bbb'
UNION ALL
SELECT
2, 'bbb'



DELETE D FROM
(
SELECT
ROW_NUMBER() OVER(PARTITION BY EMPID,EmpName ORDER BY EMPID) AS ROWS,
EMPID,
EmpName
FROM
@tbl
)D
WHERE
ROWS > 1

SELECT * FROM @tbl



Regards,
Mitesh OSwal
+918698619998
Dugi
Dugi
SSCrazy Eights
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Yes the CTE technique is the best to eliminate your duplicate values...so just do it!

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