From: lorid <lorid@dri.edu>
To: Kent Anderson <kenta@ezyield.com>
Cc: Pgsql-Sql@Postgresql. Org <pgsql-sql@postgresql.org>
Subject: Re: Finding duplicated values
Date: Thu, 21 Oct 2004 16:18:32 -0700
Message-ID: <417843C8.6060406@dri.edu> (raw)
In-Reply-To: <LPENJIOOLAIJBFKIBDKOIEAHFPAD.kenta@ezyield.com>
References: <LPENJIOOLAIJBFKIBDKOIEAHFPAD.kenta@ezyield.com>
Kent Anderson wrote:
> I have a few tables that have duplicated values from an import from a
> different database. I have two keys I tried to set as primary and got
> an error
> ERROR: could not create unique index
> DETAIL: Table contains duplicated values.
>
> Is there some join I can use to compare the hmhmkey, wmwmkey pairs
> against the table to find duplicate values? Each pair key should be
> unique but the old database was less than normalized.
>
> I was trying to use the code below but it returned no rows.
>
> SELECT hmhmkey, wmwmkey
> FROM exceptions
> EXCEPT
> SELECT hmhmkey, wmwmkey
> FROM exceptions;
>
> Any suggestions?
>
> Kent Anderson
> EZYield.com
> 407-629-0900
> www.ezyield.com <http://www.ezyield.com/;
>
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This might do it...
If you do this on the table that had duplicates you wont need to join
select count(hmhmkey),count(wmwmkey) from
exceptions group by hmhmkey,wmwmkey having count(hmhmkey) >1 or having
count(wmwmkey) >1;
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To: pgsql-sql@postgresql.org
Cc: lorid@dri.edu, kenta@ezyield.com
Subject: Re: Finding duplicated values
In-Reply-To: <417843C8.6060406@dri.edu>
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