Re: pivot query with count
| От | Tony Capobianco |
|---|---|
| Тема | Re: pivot query with count |
| Дата | |
| Msg-id | CABx31i4E52vtWjCwf-qQGbNC2vxE+xFPfhsBKBiFbTTOsp7xPQ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: pivot query with count (David Johnston <polobo@yahoo.com>) |
| Список | pgsql-sql |
Thank you very much for your response. However, I'm unclear what you want me to substitute for sum(...)?
select '1' as "num_ads", sum(...)
from
(select a.userid from
user_event_stg2 a, user_region b
where a.userid = b.userid
and b.region_code = 1000
and a.messagetype = 'impression'
group by a.userid having count(a.userid) = 1)
group by num_ads;
from
(select a.userid from
user_event_stg2 a, user_region b
where a.userid = b.userid
and b.region_code = 1000
and a.messagetype = 'impression'
group by a.userid having count(a.userid) = 1)
group by num_ads;
I was able to eliminate that sub-select per your recommendation. That makes things a bit easier.
Thanks.
On Fri, Apr 12, 2013 at 11:29 PM, David Johnston <polobo@yahoo.com> wrote:
My prior comment simply answers your question. You likely can rewrite your
query so that a separate grouping layer is not needed (or rather the group
by would exist in the main query and you minimize the case/sub-select column
queries and use aggregates and case instead).
David J.
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