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help / color / mirror / Atom feedFrom: Muhammad Usman Khan <[email protected]>
To: Rich Shepard <[email protected]>
Cc: [email protected]
Subject: Re: Removing duplicate rows in table
Date: Thu, 12 Sep 2024 09:06:00 +0500
Message-ID: <CAPnRvGs1+uqWe1ny0jMJapYMNR+i=jDvWRL4YwsgsUdAQFSNGg@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
Hi,
You can try the following CTE which removes all the identical rows and only
leave single row
WITH CTE AS (
SELECT ctid, ROW_NUMBER() OVER (PARTITION BY proj_nbr, proj_name,
start_date, end_date, description, notes ORDER BY proj_nbr) AS rn
FROM projects
WHERE proj_nbr = '4242.02'
)
DELETE FROM projects
WHERE ctid IN (
SELECT ctid FROM CTE WHERE rn > 1
);
On Tue, 10 Sept 2024 at 20:07, Rich Shepard <[email protected]>
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.
>
> 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
>
>
>
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Subject: Re: Removing duplicate rows in table
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