Ah... Yes. Good point. I like this because I was planning on keeping
the output somewhere for a while. (In case we need an "accounting" at
some point) So it will be easy enough to dump what's being deleted to
the screen while we loop over our candidates.
Thanks!
On Tue, Jul 14, 2009 at 10:16 AM,
That's assuming that there is a unique identifier field, like an auto
increment field. Although that could be added after the fact. Also,
you need to run the query multiple times until it returns no affected
records. So if there are 4 copies of a record, it would need to be run
3 times to get rid o
You can combine the two queries you have in option 3 (you'll need to
change field names, but you should get the idea), something like this:
DELETE table1 FROM table1, (SELECT MAX(id) AS dupid, COUNT(id) AS
dupcnt FROM table1 WHERE field1 IS NOT NULL GROUP BY link_id HAVING
dupcnt>1) AS dups W
@lists.mysql.com
Subject: Removing Duplicate Records
In our database we have an Organizations table and a Contacts table,
and a linking table that associates Contacts with Organizations.
Occassionally we manually add to the linking table with information
gleaned from outside data sources. This is common
In our database we have an Organizations table and a Contacts table,
and a linking table that associates Contacts with Organizations.
Occassionally we manually add to the linking table with information
gleaned from outside data sources. This is common enough to be
annoying, since it ends up with du
If you use IGNORE in the insert IGNORE into new_table you will get the
result you want.
> -Original Message-
> From: walt [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, July 30, 2002 3:11 PM
> To: David Kramer; [EMAIL PROTECTED]
> Subject: Re: removing duplicate records
&g
sue.
DK
-Original Message-
From: Vivian Wang [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 30, 2002 2:37 PM
To: walt; David Kramer; [EMAIL PROTECTED]
Subject: Re: removing duplicate records
Walt,
Don't trust group by.
I am using mysqldump and sort -u on *nix for duplicate.
Try bo
> > values contained in the other columns necessary? If you tell me more about
> > what your trying to do and provide some Table DDL I can help you write this
> > query. Just let me know!
> >
> > Thanks,
> >
> > DK
> >
> > group by statement
>
provide some Table DDL I can help you write this
> query. Just let me know!
>
> Thanks,
>
> DK
>
> group by statement
>
> -Original Message-
> From: walt [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, July 30, 2002 12:43 PM
> To: [EMAIL PROTECTED]
>
statement
-Original Message-
From: walt [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 30, 2002 12:43 PM
To: [EMAIL PROTECTED]
Subject: removing duplicate records
Does anyone know a good way find and remove duplicate records from a table?
I can create an identical table structure and use
If the columns are defined as not null, just add a unique index on all
the fields.
alter table ignore add unique(col1.col2.col#);
walt wrote:
>Does anyone know a good way find and remove duplicate records from a table?
>I can create an identical table structure and use a script to pull records
Does anyone know a good way find and remove duplicate records from a table?
I can create an identical table structure and use a script to pull records
from the existing table and insert them into the new table if they are not
duplicates, but I'd rather not do it that way. Here is an example of a
12 matches
Mail list logo
