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 Query to delete the duplicate rows
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Starting Member

49 Posts

Posted - 11/04/2010 :  12:04:03  Show Profile  Reply with Quote
Can anyone help me with the query to delete duplicate rows from a table which does not have any identity column

Posting Yak Master

102 Posts

Posted - 11/05/2010 :  03:34:10  Show Profile  Visit Devart's Homepage  Reply with Quote

For example:

create table t_table(
f1 int,
f2 int,
f3 int

insert into t_table values(1,1,1);
insert into t_table values(2,2,2);
insert into t_table values(2,2,2);
insert into t_table values(2,2,2);
insert into t_table values(3,3,3);
insert into t_table values(3,3,3);
insert into t_table values(4,4,4);

declare @table table
(f1 int,f2 int, f3 int);
insert into @table
select f1,f2,f3 from t_table group by f1,f2,f3 having count(*)>1;

delete from t_table
from t_table t1
inner join @table t2
on t1.f1=t2.f1 and t1.f2=t2.f2 and t1.f3=t2.f3

insert into t_table
select f1,f2,f3 from @table;

Best regards,

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Starting Member

1 Posts

Posted - 11/07/2010 :  06:30:01  Show Profile  Reply with Quote
thanks too much it a very usful to me

Mohammed Mohammed Abdelhay
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Flowing Fount of Yak Knowledge

8781 Posts

Posted - 11/07/2010 :  06:39:19  Show Profile  Visit webfred's Homepage  Reply with Quote
If you are using SQL Server 2005 or higher:
delete dt
row_number() over (partition by f1,f2,f3 order by f1) as rownum,
from t_table) as dt
where rownum > 1

edit: typo

No, you're never too old to Yak'n'Roll if you're too young to die.

Edited by - webfred on 11/07/2010 06:39:51
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