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Need to delete duplicate data

Author

Topic

satish.gorijala
Posting Yak Master

182 Posts

Posted - 2009-11-13 : 00:05:59

Hi Team,
i have one table with 10 columns and 2 lakh records. i want to remove duplicate records(special case).

Here duplication in the sense, except two columns remaining 8 columns contain same data. So i need to remove the duplicates among them. let we see my data table here


Col1 Col2 Col3 Col4 Col5 Col6	Col7	Col8	Col9	Col10
TX   abc  0 	0   0	 0	0	0	0	l
Tx   def  0	0   0	 0	0	0	0	k
Ag   xyz  8     7   0    9	0	0	0	p
Ag   jhk  8     7   0    9	0	0	0	m

Here First two rows are duplicates. We need to ignore columns Col2,col10. Remaining data are same for first 2 rows. So we need to delete one row from the table.
Similary last 2 rows data are same exceo for Col2 and Col10.
Like this my whol table contains data with 1 lakh records...i need to remove duplicates ignoring Col2 and Col10 columns. How can i do this? Can any one help me the query for this.

Thanks in advance

developer :)

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2009-11-13 : 00:09:02

[code]
delete d
from
(
select *, row_no = row_number() over (partition by Col1, Col3, Col4, Col5, Col6, Col7, Col8, Col9 order by Col2, Col10)
from yourtable
) d
where d.row_no > 1
[/code]

KH
[spoiler]Time is always against us[/spoiler]

satish.gorijala
Posting Yak Master

182 Posts

Posted - 2009-11-13 : 00:32:59

I am not getting accurate results by below query...
some thing is missing..i hope

quote:

Originally posted by khtan


delete d
from   
(
    select *, row_no = row_number() over (partition by Col1, Col3, Col4, Col5, Col6, Col7, Col8, Col9 order by Col2, Col10)
    from   yourtable
) d
where d.row_no > 1

KH
[spoiler]Time is always against us[/spoiler]

developer :)

khtan
In (Som, Ni, Yak)

17689 Posts

Posted - 2009-11-13 : 00:39:47

example ?

KH
[spoiler]Time is always against us[/spoiler]

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