| From: | Robert Stanford <rstanford(at)gmail(dot)com> |
|---|---|
| To: | Thiemo Kellner <thiemo(at)gelassene-pferde(dot)biz> |
| Cc: | "pgsql-generallists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Window function? |
| Date: | 2022-06-04 13:18:06 |
| Message-ID: | CAC1FqCEkcwPz4_hqZ3_0Yav010veB+VtGNjJDBnEUTXwx7j6xw@mail.gmail.com |
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| Lists: | pgsql-general |
On Sat, 4 Jun 2022 at 22:56, Thiemo Kellner <thiemo(at)gelassene-pferde(dot)biz>
wrote:
> Hi Robert
>
> Interesting problem. I need to think about it.
>
> You need to figure out when Input changes. You can achieve this by using
> lead or lag (depending of the sort direction over start)
> https://www.postgresql.org/docs/current/functions-window.html .
>
After a bit of poking around this seems to get things going in the right
direction.
select row_number() over (order by start) - row_number() over (partition
by input order by start)
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