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Re: Finding duplicated values

From: lorid <lorid(at)dri(dot)edu>
To: Kent Anderson <kenta(at)ezyield(dot)com>
Cc: "Pgsql-Sql(at)Postgresql(dot) Org" <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Finding duplicated values
Date: 2004-10-21 23:18:32
Message-ID: 417843C8.6060406@dri.edu (view raw or flat)
Thread:
Lists: pgsql-sql
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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