Re: Removing duplicate rows in table

On Tue, Sep 10, 2024 at 11:07 AM Rich Shepard <rshepard(at)appl-ecosys(dot)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?
>

https://www.postgresqltutorial.com/postgresql-window-function/postgresql-row_number/

I'd use row_number to delete records where row_number > 1.

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