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Message-ID: <32765388-836c-4c00-bad0-665f0aa77ea8@aklaver.com>
Date: Tue, 10 Sep 2024 08:22:36 -0700
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Subject: Re: Removing duplicate rows in table
To: Rich Shepard <rshepard@appl-ecosys.com>, pgsql-general@postgresql.org
References: <e4688faf-de51-93ef-2db-f2acacbd658@appl-ecosys.com>
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From: Adrian Klaver <adrian.klaver@aklaver.com>
In-Reply-To: <e4688faf-de51-93ef-2db-f2acacbd658@appl-ecosys.com>
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On 9/10/24 08:07, Rich Shepard wrote:
> I've no idea how I entered multiple, identical rows in a table but I 
> want to
> delete all but one of these rows.

Is there a Primary Key or Unique index on this table?

> 
> Here's an example:
> 
> bustrac=# select * from projects where proj_nbr = '4242.01';
>   proj_nbr |   proj_name    | start_date |  end_date  |  description  | 
> notes 
> ----------+----------------+------------+------------+---------------+-------
>   4242.01  | Expert witness | 2008-10-15 | 2008-10-28 | Consol Energy |
>   4242.01  | Expert witness | 2008-10-15 | 2008-10-28 | Consol Energy |
>   4242.01  | Expert witness | 2008-10-15 | 2008-10-28 | Consol Energy |
>   4242.01  | Expert witness | 2008-10-15 | 2008-10-28 | Consol Energy | 
> (4 rows)
> 
> How do I clean this up so there's only a single row for this project 
> number?
> 
> TIA,
> 
> Rich
> 
> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com