To check and remove duplicate records

Hi guys,.

I have a T1 table where my col_1, col_2, col_3 columns are primary keys and the table is to have a huge volume of data recorded about 200 billion. Before you add the primary key, I need to check if there are duplicates and then delete these records. Who will be fastest way to check, I used below

Select * from T1

where rowid in (select rn (INF. Select rowid,

DENSE_RANK() on ln (score of col1, col2, col3 order by rowid)

from T1)

where ln <>1);

Is there another way using the analytical function can be faster to access the records of 200 billion

Sven wrote:

Instead of making a deletion consider to re-create the table using only the unique values. Very often, it's much faster than a delete even if more data is moved, but as always, it depends.

It would be useful if you know how many lines you have and how duplicates are for example (the number of records is removed).

Also, you should have a comparable test database, which is not always easy to have with large datasizes are invloved.

Yes, Sven is quite right, ETG might actually be faster to remove duplicates of the original. But you will need to investigate the volume of data.

create table T2 as

Select col1, col2, col3,..., coln - all original columns except rn

from (select t.*, row_number() on rn (score of col1, col2, col3 order by rowid)

where rn = 1

Then hover over any constraint, etc. and drop T with purge, rename T2 in T.

Tags: Database

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3.6.2 the numbers help find and remove duplicates in 2 columns

Could someone help me please. I run a karaoke business. As you may have guessed I have books with many songs, 64 000 and more than 75% of these songs are duplicates so you can imagine by train to sort. Option 1 I could manually go through my list by removing duplicates or option 2 attempt to find a formula that works save me hours of blind deletion. Is there someone out there who can help? It would be much appreciated thanks.

Here is a sample of the document I'm working.

Hi robi.

Here is a solution of Craig s. Ruddock in this discussion Re: duplicates warning formula

Formula in B2 (fill down)

= IF (COUNTIF($A,A) = 1",","duplicate")

Now sort by column A

Remove all but one of the "duplicate" lines for each song.

Kind regards

Ian.

Query - remove duplicate records, based on the value of a field

Hello

Please view the information below,
How to delete records when his number 0
AND these records (name) repeat with count > 0

existing data

 name                       loc                            count
------------------------------------------------------------------------

aaa          a1          10
aaa          a1          0
bbb          b1          0
ccc          c1          0
dcc          d1          11
dcc          d1          0

required output

---------


 name                       loc                            count
------------------------------------------------------------------------

aaa          a1          10
bbb          b1          0
ccc          c1          0
dcc          d1          11



remove these records -

-----------

aaa          a1          0
dcc          d1          0

Thank you.

I guess that loc always matches the name. Thus, to find the lines of stay is just a simple group of

with data as(
select 'aaa' name,'a1' loc,10 count from dual union all
select 'aaa','a1',0 from dual union all
select 'bbb','b1',0 from dual union all
select 'ccc','c1',0 from dual union all
select 'dcc','d1',11 from dual union all
select 'dcc','d1',0 from dual )

select
  name
, loc
, max(count) cnt
from data
group by
  name
, loc
order by
  name
, loc

NAME     LOC     CNT
aaa     a1     10
bbb     b1     0
ccc     c1     0
dcc     d1     11

to find that the other is just a minus

with data as(
select 'aaa' name,'a1' loc,10 count from dual union all
select 'aaa','a1',0 from dual union all
select 'bbb','b1',0 from dual union all
select 'ccc','c1',0 from dual union all
select 'dcc','d1',11 from dual union all
select 'dcc','d1',0 from dual )

select name,loc,count from data
minus
select
  name
, loc
, max(count) cnt
from data
group by
  name
, loc
order by
  name
, loc

NAME     LOC     COUNT
aaa     a1     0
dcc     d1     0

would be a delete

delete from data
where
(name,loc,count)
in
(select name,loc,count from data
minus ..

concerning

How to find and remove duplicates?

How to find and delete duplicate files?

Hello

Are what duplicate files you referring?

I suggest you follow these steps:

a. open search by pressing the logo Windows + F key.

(b) in the search box, type the name of the file that you suspect could be duplicated.

c. in the toolbar, click view and then click on details.

d. scroll down the list, looking for files with the file names and file extensions. When you find one or more of the files that match, compare their dates in the Date Modified column. If the dates are the same, the files are probably duplicates. You can open files and compare their contents to be sure.

e. search files that are probably double results

f. click on the file you want to delete and press DELETE.

How can I control and remove duplicate files

I want to check my computer for duplicate files and then delete them to free up space

Hi houdagazzah,

Please take a look at the thread that is similar to the following for a solution:

http://answers.Microsoft.com/en-us/Windows/Forum/windows_vista-performance/deleting-duplicate-files/50ad7971-221C-417D-8b8e-422b16e4ca8d

How to remove duplicate records...
Hello

I have a strange scenario below is the structure of the table

of km
Bangalore, Mumbai 100
Mumbai, Bangalore 100
Bangalore, Chennai 50

I want the output as given that the distance is even bangalore to Bombay and mumbai to bangalore I want only one instance...

of km
Bangalore, Mumbai 100
Bangalore, Chennai 50

I was able to find duplicate using following query records but put not able to come to the final...

Select a.frm, b.frm, a.km
distance a distance b
where a.frm = b.too
and b.frm = a.too

Thanks in advance...

Sree
```
WITH t AS (
            SELECT 'Bangalore' col1, 'Mumbai' col2, 100 col3 FROM DUAL
           UNION ALL
            SELECT 'Mumbai', 'Bangalore', 100 FROM DUAL
           UNION ALL
            SELECT 'Bangalore', 'Chennai', 50 FROM DUAL
          )
SELECT  DISTINCT LEAST(col1,col2) col1,
                 GREATEST(col1,col2) col1,
                 col3
  FROM  t
/

COL1      COL1            COL3
--------- --------- ----------
Bangalore Mumbai           100
Bangalore Chennai           50

SQL> 
```
SY.

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Really exactly depends on where you see what you believe are duplicates.

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First run Disk Cleanup

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Please check and remove this ad
Hello;

I don't know how I should do this and because of this, I write in "General database" because this area often gets reviewed:

This should be deleted:

http://forums.Oracle.com/forums/thread.jspa?threadID=2240217 & tstart = 0

The example of links takes you to a site for adult.

If there is a better way to manage this please let me know.

Best regards

mseberg
I moved this post to the forum moderators OTN.
visible by the moderators and administrators of sites for such household things.

The Admins will deal with their user account.

For future reference, there is a thread 'Please delete spam' in the community feedback forum.
It would be as good a place for this kind of application.

The current iteration of it is:
The specified item was not found.
When it get too large and unwieldy, entries
It must also be moved and a new one created to replace.

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I'm trying to remove the duplicates in my iTunes (in thousands) library. I view "replica", but for some songs, it checks all instances of the same song, so I can't delete checked without losing these songs in total. Is there a way to fix this, or what I have to go through the entire library of the song?

Using the latest version of iTunes on a windows PC. I read the instructions for the removal of duplicates, but my situation is not covered.

Thank you

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(If you don't see the menu bar press ALT to temporarily view or CTRL + B to keep displayed.)

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TT2

What to check and how to manage audit records in oracle 11 GR 2
can someone help me how to check and manage audit records in oracle 11 g 2
867726 wrote:
can someone help me how to check and manage audit records in oracle 11 g 2

Hello

I recommend to have a read of this link for details http://download.oracle.com/docs/cd/E11882_01/server.112/e10575/tdpsg_auditing.htm#TDPSG50000

See you soon

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Photos detects duplicates when you import pictures and when you synchronize with ICPL

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LN

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To check and remove duplicate records

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