Re: Removing duplicate rows in table

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 <rshepard@appl-ecosys.com>
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
>
>
>