Comments on: SQL SERVER – Delete Duplicate Records – Rows

By: ManojKumarM

ManojKumarM — Tue, 23 Apr 2013 17:41:56 +0000

Perfect :-) Thanks for the hint :-)

By: shahram

shahram — Mon, 22 Apr 2013 17:21:41 +0000

thanks

By: Ashish Sahu

Ashish Sahu — Sun, 14 Apr 2013 10:26:45 +0000

WHILE (SELECT COUNT(*) FROM TBLEMP WHERE EMPNO IN (SELECT empno from tblemp group by empno having count(empno)>1))>1

DELETE top(1) FROM TBLEMP WHERE EMPNO IN (SELECT empno from tblemp group by empno having count(empno)>1)

or
DELETE duplicates FROM
(SELECT ROW_NUMBER() OVER (PARTITION BY firstname, lastname, EMPNO, salary,dept ORDER BY empno) cnt
FROM tblEmp) duplicates
WHERE duplicates.Cnt > 1

By: Jeff Rivera

Jeff Rivera — Sun, 24 Mar 2013 19:31:17 +0000

If we assume two duplicates doesn’t this delete both records? How does your delete statement only remove one duplicate or is your goal to delete all duplicates? You can do a delete top but you must know how many duplicates

By: Rakesh

Rakesh — Fri, 15 Mar 2013 13:42:14 +0000

DELETE
FROM TestTable
WHERE TestTable.%%physloc%%
NOT IN (SELECT MIN(b.%%physloc%%)
FROM TestTable b
GROUP BY b.column1, b.Column2)

By: Tao-Lao

Tao-Lao — Fri, 15 Mar 2013 02:27:46 +0000

Like this answer

By: Atanu Sinha

Atanu Sinha — Wed, 06 Mar 2013 15:15:22 +0000

I believe the best way to delete (multiple) dupes from a table ( that has a primary key) would be as follows:

Delete from table
where ID not in
(Select MIN(id)
from table
group by duplicateCol1, duplicateCol2……duplicateColn)

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By: DoronF

DoronF — Tue, 19 Feb 2013 20:19:45 +0000

Hi Pinal,

Thanks for the article and also wrote an article about this subject found at: http://www.dfarber.com/computer-consulting-blog/2011/12/26/remove-duplicate-records-in-sql.aspx

Regards,

Doron

By: David Brown

David Brown — Tue, 12 Feb 2013 14:56:22 +0000

Great post! Thanks!

By: raamu jeee

raamu jeee — Sun, 03 Feb 2013 19:34:55 +0000

create table as select distinct * from ;

By: madhivanan

madhivanan — Tue, 08 Jan 2013 13:44:47 +0000

Import data into staging tables and from there remove duplicates and them to final table

By: madhivanan

madhivanan — Tue, 08 Jan 2013 13:40:07 +0000

It can be easily done with row_number() function. Refer point 6 at http://beyondrelational.com/modules/2/blogs/70/posts/10802/multipurpose-rownumber-function.aspx

By: Noor Ul Islam

Noor Ul Islam — Sat, 05 Jan 2013 12:15:29 +0000

delete from duplicate
where fname in
(
select d1.fname
from duplicate d1
inner join duplicate d2
on d1.fname=d2.fname and d1.Lname=d2.Lname
group by d1.fname, d1.Lname
having count (d1.fname)>1 and count(d1.Lname)>1
)

By: Vinoth kumar

Vinoth kumar — Wed, 19 Dec 2012 06:15:57 +0000

different source files has around 5 lakhs- 10 lakhs records with duplicates and final table will be having 5 billion records . How you will remove the duplicate records before inserting it into final table.

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By: Prashant

Prashant — Fri, 23 Nov 2012 06:29:20 +0000

HI
you can simply use common table expression (CTE).
in that you need to use Rank funcation

With t AS
(
Select , //in which u want to delete duplicate record.
RANK(ORDER BY PARTITION BY ) AS ‘Rank’
from
)
DELETE FROM t
WHERE t.Rank>1

Thanks

By: madhivanan

madhivanan — Tue, 20 Nov 2012 08:47:24 +0000

Have you tried this?

“delete from Product where Experddate in (select Experddate from Product where proID=@prID order by Experddate ASC)”

By: mathu

mathu — Thu, 08 Nov 2012 04:27:15 +0000

this is used to decrease the quantity from order by expiry date

“delete from Product where Experddate= (select Experddate from Product where proID=@prID order by Experddate ASC)”

but it is not working “plz help me” friends

By: Ketan Barasara

Ketan Barasara — Fri, 17 Aug 2012 10:46:40 +0000

This blog is very useful to me

By: Ketan Barasara

Ketan Barasara — Fri, 17 Aug 2012 10:45:57 +0000

By: Mahesh

Mahesh — Fri, 17 Aug 2012 10:14:19 +0000

With NewData
as
(
select s.*,DENSE_RANK() OVER
(PARTITION BY s.Value1 order by newID() ) r from SampleData s
)

DELETE FROM NewData where r=2

By: LAKSHMANARAJ

LAKSHMANARAJ — Wed, 11 Jul 2012 16:32:24 +0000

HI Pinal sir,
Nice,Where i will download these type of SQL queries for interview(Pdf).please let me know the link.

By: Avanti Papoo Choudhary

Avanti Papoo Choudhary — Mon, 02 Jul 2012 10:05:32 +0000

Thanx Mr. Pinal it’s very useful…it has solved my major problems

By: jymy solunki

jymy solunki — Sat, 30 Jun 2012 09:36:01 +0000

This logic is delete all record only not be douplicate