Re: how to construct sql

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От Justin Graf
Тема Re: how to construct sql
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Msg-id 4C06D0EC.9050206@magwerks.com
обсуждение исходный текст
Ответ на Re: how to construct sql  (Wes James <comptekki@gmail.com>)
Список pgsql-sql
On 6/2/2010 2:52 PM, Wes James wrote:
>
>   **snip***
> Thx it is closer (with an end in the case):
>
> select
> case when MAX(page_count_count) - MIN(page_count_count)>  0 then
>         MAX(page_count_count) - MIN(page_count_count)
> else
>         MAX(page_count_count)
> end as day_max
> from page_count
> group by page_count_pdate order by page_count_pdate;
>
> the else puts out the total count on that day.  I would need
> max(page_count_count) - max(page_count_count_of_previous_day)
>
> thx,
>
> -wes
>

A windowing query makes sense in this case  which i'm not very good at



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