Re: Very newbie question

On 2023-10-25 17:48:46 +0200, Olivier Gautherot wrote:
> El mié, 25 oct 2023 16:58, Олег Самойлов <splarv@ya.ru> escribió:
>     Okey, I see no one was be able to solve this problem. But I could. May be
>     for someone this will be useful too. There is solution.
[...]
>     Now query is:
> 
>     SELECT generate_series(min(id)/10000000, max(id)/10000000) AS n FROM
>     delivery) as part_numbers
>              WHERE (SELECT max(created_at) from delivery where n*10000000 <=id
>     and id < (n+1)*10000000)
>                 < CURRENT_DATE-'3 month'::interval;
> 
>     Return the same (number of partition need to archive), accelerated by two
>     btree index: on id and created_at. Works very quick, less then second.
[...]
> Your fast solution will work as long as you don't have missing sequences (like
> deleted rows).

Why do you think this would break with missing sequence numbers?

        hp

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