Re: delete query using CTE

Thank you Michael & David for your extremely fast response. With your help
I was able to fix the query as follows:

DELETE FROM price_old
WHERE ctid IN
(SELECT ctid
FROM
(SELECT ctid,
ROW_NUMBER() OVER( PARTITION BY ticker, date
ORDER BY ctid ) AS my_row_num
FROM price_old ) t
WHERE t.my_row_num > 1 );

On Sun, Mar 13, 2022 at 10:52 AM David G. Johnston <
david(dot)g(dot)johnston(at)gmail(dot)com> wrote:

> On Sun, Mar 13, 2022 at 7:44 AM Roger Bos <roger(dot)bos(at)gmail(dot)com> wrote:
>
>> WITH cte AS
>> ( SELECT *, ROW_NUMBER() OVER ( PARTITION BY ticker, date ORDER BY
>> ticker, date) my_row_num FROM price_old)
>> DELETE FROM cte WHERE my_row_num > 1;
>>
>> I get the following error:
>>
>> ERROR: relation "cte" does not exist LINE 3: DELETE FROM cte WHERE
>> my_row_num > 1;
>>
>
> Right...when all is said and done DELETE removes rows from permanent
> tables. While "cte" does exist it is a virtual table and so doesn't
> qualify. A permanent relation named cte does not exist from which
> permanent data can be deleted.
>
> See the following for ways to deal with duplicate removal on incorrectly
> constrained tables.
>
>
> https://harshitjain.home.blog/2019/06/17/postgresql-how-to-delete-duplicate-rows-in-postgresql/
>
> David J.
>
>